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On this day

Indonesian Navy submarine KRI Nanggala (402) sinks in the Bali Sea during a military drill, killing all 53 on board.

2021

view article

Eight bombs explode at churches, hotels, and other locations in Sri Lanka on Easter Sunday, killing at least 269.

2019

view article

The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and at least 12 deaths from Legionnaires' disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

2014

view article

Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, killing one person and injuring 116 others.

2012

view article

The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian president Viktor Yanukovych and Russian president Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

2010

view article

Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.

2004

view article

Four people are killed and 75 are injured in a train accident in Jokela, Finland.

1996

view article

The Supreme Court in La Paz, Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.

1993

view article

Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.

1989

view article

The Tamil Tigers are blamed for a car bomb that detonates in the Sri Lankan capital city of Colombo, killing 106 people.

1987

view article

The compound of the militant group The Covenant, The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.

1985

view article

Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.

1982

view article

Annie opens on Broadway.

1977

view article

Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.

1975

view article

Astronauts John Young and Charles Duke fly Apollo 16's Apollo Lunar Module to the Moon's surface, the fifth NASA Apollo Program crewed lunar landing.

1972

view article

A few days before the general election in Greece, Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.

1967

view article

A tornado outbreak in Illinois, United States, kills over 50 and injures over 1,000. Belvidere sustains over 500 casualties as a violent tornado strikes the high school. Another tornado near Chicago causes another 500 casualties, devastating Oak Lawn.

1967

view article

Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.

1966

view article

The 1964–1965 New York World's Fair opens for its second and final season.

1965

view article

A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.

1964

view article

The first election of the Universal House of Justice is held, marking its establishment as the supreme governing institution of the Baháʼí Faith.

1963

view article

The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.

1962

view article

Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.

1960

view article

United Air Lines Flight 736 collides with a United States Air Force fighter jet near Arden, Nevada in what is now Enterprise, Nevada.

1958

view article

Secretary's Day (now Administrative Professionals' Day) is first celebrated.

1952

view article

The Nainital wedding massacre occurs, killing 22 members of the Harijan caste.

1950

view article

United Nations Security Council Resolution 47 relating to Kashmir conflict is adopted.

1948

view article

The U.S. Weather Bureau records that a tornado which struck Timber Lake, South Dakota was 4 miles (6.4 km), among the widest tornadoes on record.

1946

view article

World War II: Soviet forces south of Berlin at Zossen attack the German High Command headquarters.

1945

view article

The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1994, it is revealed to be a hoax).

1934

view article

Al-Baqi cemetery, former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.

1926

view article

World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.

1918

view article

Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.

1914

view article

Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.

1898

view article

Norway formally adopts the Krag–Jørgensen bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.

1894

view article

Australian labour movement: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an eight-hour day.

1856

view article

Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.

1836

view article

Benderli Ali Pasha arrives in Constantinople as the new Grand Vizier of the Ottoman Empire; he remains in power for only nine days before being sent into exile.

1821

view article

Two Austrian army corps are driven from Landshut by a First French Empire army led by Napoleon as two French corps to the north hold off the main Austrian army on the first day of the Battle of Eckmühl.

1809

view article

Action of 21 April 1806: A French frigate escapes British forces off the coast of South Africa.

1806

view article

Twelve thousand Wahhabis sack Karbala, killing over three thousand inhabitants.

1802

view article

War of the First Coalition: In the climax of the Montenotte Campaign, Napoleon Bonaparte decisively defeats the army of Piedmont at the Battle of Mondovi, leading to Piedmont's surrender a week later and decisively turning the Italian campaign in France's favor.

1796

view article

Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.

1792

view article

John Adams sworn in as first US Vice President (nine days before George Washington).

1789

view article

George Washington's reception at Trenton is hosted by the Ladies of Trenton as he journeys to New York City for his first inauguration.

1789

view article

The city of Rattanakosin, now known internationally as Bangkok, is founded on the eastern bank of the Chao Phraya River by King Buddha Yodfa Chulaloke.

1782

view article

The Wignacourt Aqueduct is inaugurated in Malta.

1615

view article

The last ruler of the Lodi dynasty, Ibrahim Lodi, is defeated and killed by Babur in the First Battle of Panipat.

1526

view article

Henry VIII ascends the throne of England on the death of his father, Henry VII.

1509

view article

The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.

1506

view article

The Diocese of Pisa is elevated to the rank of metropolitan archdiocese by Pope Urban II.

1092

view article

The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines): the Commander-in-Chief of the Kingdom of Tondo, as represented by the Honourable Jayadewa, Lord Minister of Pailah, pardons from all debt the Honourable Namwaran and his relations.

900

view article

Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.

-43

view article

Romulus founds Rome (traditional date).

-753

view article

On this day

Indonesian Navy submarine KRI Nanggala (402) sinks in the Bali Sea during a military drill, killing all 53 on board.

2021

view article

Eight bombs explode at churches, hotels, and other locations in Sri Lanka on Easter Sunday, killing at least 269.

2019

view article

The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and at least 12 deaths from Legionnaires' disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

2014

view article

Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, killing one person and injuring 116 others.

2012

view article

The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian president Viktor Yanukovych and Russian president Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

2010

view article

Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.

2004

view article

Four people are killed and 75 are injured in a train accident in Jokela, Finland.

1996

view article

The Supreme Court in La Paz, Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.

1993

view article

Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.

1989

view article

The Tamil Tigers are blamed for a car bomb that detonates in the Sri Lankan capital city of Colombo, killing 106 people.

1987

view article

The compound of the militant group The Covenant, The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.

1985

view article

Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.

1982

view article

Annie opens on Broadway.

1977

view article

Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.

1975

view article

Astronauts John Young and Charles Duke fly Apollo 16's Apollo Lunar Module to the Moon's surface, the fifth NASA Apollo Program crewed lunar landing.

1972

view article

A few days before the general election in Greece, Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.

1967

view article

A tornado outbreak in Illinois, United States, kills over 50 and injures over 1,000. Belvidere sustains over 500 casualties as a violent tornado strikes the high school. Another tornado near Chicago causes another 500 casualties, devastating Oak Lawn.

1967

view article

Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.

1966

view article

The 1964–1965 New York World's Fair opens for its second and final season.

1965

view article

A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.

1964

view article

The first election of the Universal House of Justice is held, marking its establishment as the supreme governing institution of the Baháʼí Faith.

1963

view article

The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.

1962

view article

Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.

1960

view article

United Air Lines Flight 736 collides with a United States Air Force fighter jet near Arden, Nevada in what is now Enterprise, Nevada.

1958

view article

Secretary's Day (now Administrative Professionals' Day) is first celebrated.

1952

view article

The Nainital wedding massacre occurs, killing 22 members of the Harijan caste.

1950

view article

United Nations Security Council Resolution 47 relating to Kashmir conflict is adopted.

1948

view article

The U.S. Weather Bureau records that a tornado which struck Timber Lake, South Dakota was 4 miles (6.4 km), among the widest tornadoes on record.

1946

view article

World War II: Soviet forces south of Berlin at Zossen attack the German High Command headquarters.

1945

view article

The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1994, it is revealed to be a hoax).

1934

view article

Al-Baqi cemetery, former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.

1926

view article

World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.

1918

view article

Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.

1914

view article

Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.

1898

view article

Norway formally adopts the Krag–Jørgensen bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.

1894

view article

Australian labour movement: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an eight-hour day.

1856

view article

Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.

1836

view article

Benderli Ali Pasha arrives in Constantinople as the new Grand Vizier of the Ottoman Empire; he remains in power for only nine days before being sent into exile.

1821

view article

Two Austrian army corps are driven from Landshut by a First French Empire army led by Napoleon as two French corps to the north hold off the main Austrian army on the first day of the Battle of Eckmühl.

1809

view article

Action of 21 April 1806: A French frigate escapes British forces off the coast of South Africa.

1806

view article

Twelve thousand Wahhabis sack Karbala, killing over three thousand inhabitants.

1802

view article

War of the First Coalition: In the climax of the Montenotte Campaign, Napoleon Bonaparte decisively defeats the army of Piedmont at the Battle of Mondovi, leading to Piedmont's surrender a week later and decisively turning the Italian campaign in France's favor.

1796

view article

Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.

1792

view article

John Adams sworn in as first US Vice President (nine days before George Washington).

1789

view article

George Washington's reception at Trenton is hosted by the Ladies of Trenton as he journeys to New York City for his first inauguration.

1789

view article

The city of Rattanakosin, now known internationally as Bangkok, is founded on the eastern bank of the Chao Phraya River by King Buddha Yodfa Chulaloke.

1782

view article

The Wignacourt Aqueduct is inaugurated in Malta.

1615

view article

The last ruler of the Lodi dynasty, Ibrahim Lodi, is defeated and killed by Babur in the First Battle of Panipat.

1526

view article

Henry VIII ascends the throne of England on the death of his father, Henry VII.

1509

view article

The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.

1506

view article

The Diocese of Pisa is elevated to the rank of metropolitan archdiocese by Pope Urban II.

1092

view article

The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines): the Commander-in-Chief of the Kingdom of Tondo, as represented by the Honourable Jayadewa, Lord Minister of Pailah, pardons from all debt the Honourable Namwaran and his relations.

900

view article

Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.

-43

view article

Romulus founds Rome (traditional date).

-753

view article

The Importance of Being Idle

318 points

209 comments

discussion source

Six (and a half) intuitions for KL divergence

114 points

33 comments

discussion source

MegaTrain: Full Precision Training of 100B+ Parameter LLMs on a Single GPU

Abstract page for arXiv paper 2604.05091: MegaTrain: Full Precision Training of 100B+ Parameter Large Language Models on a Single GPU

326 points

57 comments

discussion source

Who is Satoshi Nakamoto? My quest to unmask Bitcoin's creator

636 points

843 comments

discussion source

Show HN: Is Hormuz open yet?

Live status of the Strait of Hormuz

484 points

209 comments

discussion source

Expanding Swift's IDE Support

138 points

71 comments

discussion source

ML promises to be profoundly weird

615 points

602 comments

discussion source

I ported Mac OS X to the Nintendo Wii

Mac OS X 10.0 (Cheetah) running natively on the Nintendo Wii

1924 points

328 comments

discussion source

Understanding the Kalman filter with a simple radar example

433 points

66 comments

discussion source

Git commands I run before reading any code

Five git commands that tell you where a codebase hurts before you open a single file. Churn hotspots, bus factor, bug clusters, and crisis patterns.

2336 points

509 comments

discussion source

They're made out of meat (1991)

636 points

181 comments

discussion source

LittleSnitch for Linux

Discover powerful applications such as Little Snitch Mini, Little Snitch, LaunchBar and Micro Snitch.

1377 points

460 comments

discussion source

John Deere to pay $99M in right-to-repair settlement

The ag manufacturing giant will also make digital diagnostic, maintenance, and repair tools available to third parties for 10 years.

399 points

130 comments

discussion source

I imported the full Linux kernel git history into pgit

162 points

45 comments

discussion source

Muse Spark: Scaling towards personal superintelligence

393 points

367 comments

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Understanding Traceroute

I never understood how traceroute discovers each hop. Turns out it's a clever TTL trick, and about 80 lines of Rust.

177 points

25 comments

discussion source

Newly created Polymarket accounts win big on well-timed Iran ceasefire bets

Customers make hundreds of thousands of dollars as records show substantial bets made before announcement

168 points

138 comments

discussion source

USB for Software Developers: An introduction to writing userspace USB drivers

A basic introduction to USB for people that don't need to know what happens on the wire

411 points

48 comments

discussion source

What does it mean to “write like you talk”?

Subordinate clauses, phrasal modifications, and metadiscourse

103 points

87 comments

discussion source

Top Stories from Hacker News

The Importance of Being Idle

Six (and a half) intuitions for KL divergence

MegaTrain: Full Precision Training of 100B+ Parameter LLMs on a Single GPU

Who is Satoshi Nakamoto? My quest to unmask Bitcoin's creator

Show HN: Is Hormuz open yet?

Expanding Swift's IDE Support

ML promises to be profoundly weird

I ported Mac OS X to the Nintendo Wii

Understanding the Kalman filter with a simple radar example

Git commands I run before reading any code

They're made out of meat (1991)

LittleSnitch for Linux

John Deere to pay $99M in right-to-repair settlement

I imported the full Linux kernel git history into pgit

Muse Spark: Scaling towards personal superintelligence

Understanding Traceroute

Newly created Polymarket accounts win big on well-timed Iran ceasefire bets

USB for Software Developers: An introduction to writing userspace USB drivers

What does it mean to “write like you talk”?

On this day

Indonesian Navy submarine KRI Nanggala (402) sinks in the Bali Sea during a military drill, killing all 53 on board.

Eight bombs explode at churches, hotels, and other locations in Sri Lanka on Easter Sunday, killing at least 269.

Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, killing one person and injuring 116 others.

The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian president Viktor Yanukovych and Russian president Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.

Four people are killed and 75 are injured in a train accident in Jokela, Finland.

The Supreme Court in La Paz, Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.

Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.

The Tamil Tigers are blamed for a car bomb that detonates in the Sri Lankan capital city of Colombo, killing 106 people.

The compound of the militant group The Covenant, The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.

Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.

Annie opens on Broadway.

Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.

Astronauts John Young and Charles Duke fly Apollo 16's Apollo Lunar Module to the Moon's surface, the fifth NASA Apollo Program crewed lunar landing.

A few days before the general election in Greece, Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.

A tornado outbreak in Illinois, United States, kills over 50 and injures over 1,000. Belvidere sustains over 500 casualties as a violent tornado strikes the high school. Another tornado near Chicago causes another 500 casualties, devastating Oak Lawn.

Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.

The 1964–1965 New York World's Fair opens for its second and final season.

A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.

The first election of the Universal House of Justice is held, marking its establishment as the supreme governing institution of the Baháʼí Faith.

The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.

Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.

United Air Lines Flight 736 collides with a United States Air Force fighter jet near Arden, Nevada in what is now Enterprise, Nevada.

Secretary's Day (now Administrative Professionals' Day) is first celebrated.

The Nainital wedding massacre occurs, killing 22 members of the Harijan caste.

United Nations Security Council Resolution 47 relating to Kashmir conflict is adopted.

The U.S. Weather Bureau records that a tornado which struck Timber Lake, South Dakota was 4 miles (6.4 km), among the widest tornadoes on record.

World War II: Soviet forces south of Berlin at Zossen attack the German High Command headquarters.

The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1994, it is revealed to be a hoax).

Al-Baqi cemetery, former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.

World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.

Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.

Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.

Norway formally adopts the Krag–Jørgensen bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.

Australian labour movement: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an eight-hour day.

Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.

Benderli Ali Pasha arrives in Constantinople as the new Grand Vizier of the Ottoman Empire; he remains in power for only nine days before being sent into exile.

Two Austrian army corps are driven from Landshut by a First French Empire army led by Napoleon as two French corps to the north hold off the main Austrian army on the first day of the Battle of Eckmühl.

Action of 21 April 1806: A French frigate escapes British forces off the coast of South Africa.

Twelve thousand Wahhabis sack Karbala, killing over three thousand inhabitants.

War of the First Coalition: In the climax of the Montenotte Campaign, Napoleon Bonaparte decisively defeats the army of Piedmont at the Battle of Mondovi, leading to Piedmont's surrender a week later and decisively turning the Italian campaign in France's favor.

Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.

John Adams sworn in as first US Vice President (nine days before George Washington).

George Washington's reception at Trenton is hosted by the Ladies of Trenton as he journeys to New York City for his first inauguration.

The city of Rattanakosin, now known internationally as Bangkok, is founded on the eastern bank of the Chao Phraya River by King Buddha Yodfa Chulaloke.

The Wignacourt Aqueduct is inaugurated in Malta.

The last ruler of the Lodi dynasty, Ibrahim Lodi, is defeated and killed by Babur in the First Battle of Panipat.

Henry VIII ascends the throne of England on the death of his father, Henry VII.

The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.

The Diocese of Pisa is elevated to the rank of metropolitan archdiocese by Pope Urban II.

The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines): the Commander-in-Chief of the Kingdom of Tondo, as represented by the Honourable Jayadewa, Lord Minister of Pailah, pardons from all debt the Honourable Namwaran and his relations.

Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.

Romulus founds Rome (traditional date).

On this day

Indonesian Navy submarine KRI Nanggala (402) sinks in the Bali Sea during a military drill, killing all 53 on board.

Eight bombs explode at churches, hotels, and other locations in Sri Lanka on Easter Sunday, killing at least 269.

Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, killing one person and injuring 116 others.

The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian president Viktor Yanukovych and Russian president Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.