Battle of Forum Gallorum: Mark Antony, besieging Caesar's assassin Decimus Brutus in Mutina, defeats the forces of the consul Pansa, but is then immediately defeated by the army of the other consul, Aulus Hirtius.

Battle of Forum GallorumMark AntonyJulius CaesarDecimus Junius Brutus AlbinusMutina

Septimius Severus is proclaimed Roman emperor by the army in Illyricum (in the Balkans).

Septimius SeverusRoman emperorIllyricum (Roman province)Balkans

After his marriage to the Christian Doubravka of Bohemia, the pagan ruler of the Polans, Mieszko I, converts to Christianity, an event considered to be the founding of the Polish state.

Doubravka of BohemiaPaganismPolans (western)Mieszko I of PolandBaptism of Poland

Co-Emperor Otto II, a son of Otto I (the Great), marries the Byzantine princess Theophanu. She is crowned empress by Pope John XIII at Rome.

Otto II, Holy Roman EmperorOtto I, Holy Roman EmperorTheophanuPope John XIIIRome

Henry III, son of Conrad, is elected King of Germany.

Henry III, Holy Roman EmperorConrad II, Holy Roman EmperorKing of Germany

Battle of Adrianople between Bulgarians and Crusaders.

Battle of Adrianople (1205)BulgariansCrusaders

Temür, grandson of Kublai, is elected Khagan of the Mongols and Emperor of the Yuan dynasty with the reigning titles Oljeitu and Chengzong.

Temür KhanKublaiKhaganMongolsYuan dynasty

Sack of Saluzzo (Italy) by Italian-Angevine troops under Manfred V, Marquess of Saluzzo.

SaluzzoManfred V, Marquess of Saluzzo

The foundation stone of Nantes Cathedral, France is laid.

Nantes Cathedral

In England, the Yorkists under Edward IV defeat the Lancastrians under the Earl of Warwick at the Battle of Barnet; the Earl is killed and Edward IV resumes the throne.

YorkistsEdward IV of EnglandHouse of LancasterRichard Neville, 16th Earl of WarwickBattle of Barnet

A Celestial phenomenon is reported over Nuremberg, described as an aerial battle.

1561 celestial phenomenon over Nuremberg

Imperial forces are defeated by the Swedes at the Battle of Chemnitz. The Swedish victory prolongs the Thirty Years' War and allows them to advance into Bohemia.

Battle of ChemnitzThirty Years' WarBohemia

Khalsa: The Sikh religion was formalised as the Khalsa - the brotherhood of Warrior-Saints - by Guru Gobind Singh in northern India, in accordance with the Nanakshahi calendar.

KhalsaSikhKhalsaGuru Gobind SinghNanakshahi calendar

The Yamasee War begins in South Carolina.

Yamasee WarSouth Carolina

The first abolition society in North America is established. The Society for the Relief of Free Negroes Unlawfully Held in Bondage is organized in Philadelphia by Benjamin Franklin and Benjamin Rush.

Abolitionism in the United StatesPennsylvania Abolition SocietyPhiladelphiaBenjamin FranklinBenjamin Rush

Bussa, a slave in British-ruled Barbados, leads a slave rebellion and is killed. For this, he is remembered as the first national hero of Barbados.

BussaBarbadosBarbados

Noah Webster copyrights the first edition of his dictionary.

Noah WebsterWebster's Dictionary

Hungary declares itself independent of Austria with Lajos Kossuth as its leader.

Hungarian Declaration of IndependenceAustrian EmpireLajos Kossuth

U.S. President Abraham Lincoln is shot in Ford's Theatre by John Wilkes Booth; Lincoln died the next day.

Abraham LincolnAssassination of Abraham LincolnFord's TheatreJohn Wilkes Booth

U.S. Secretary of State William H. Seward and his family are attacked at home by Lewis Powell.

United States Secretary of StateWilliam H. SewardLewis Powell (conspirator)

The Four Dead in Five Seconds Gunfight is fought in El Paso, Texas.

Four Dead in Five Seconds GunfightEl Paso, Texas

The Pan-American Union is founded by the First International Conference of American States in Washington, D.C.

Pan-American UnionInternational Conference of American States

The first ever commercial motion picture house opened in New York City using ten Kinetoscopes, a device for peep-show viewing of films.

FilmKinetoscope

The Exposition Universelle begins.

Exposition Universelle (1900)

The Azusa Street Revival opens and will launch Pentecostalism as a worldwide movement.

Azusa Street RevivalPentecostalism

Hauser Dam, a steel dam on the Missouri River in Montana, U.S., fails, sending a surge of water 25 to 30 feet (7.6 to 9.1 m) high downstream.

Hauser DamSteel damMissouri RiverMontana

A massacre is organized by the Ottoman Empire against the Armenian population of Cilicia.

Adana massacreOttoman EmpireCilicia

The British passenger liner RMS Titanic hits an iceberg in the North Atlantic at 23:40 (sinks morning of April 15th).

RMS Titanic

Vitellius, commander of the Rhine armies, defeats Emperor Otho in the Battle of Bedriacum and seizes the throne.

VitelliusRhineRoman emperorOthoBattle of Bedriacum

Siege of Jerusalem: Titus, son of emperor Vespasian, surrounds the Jewish capital with four Roman legions.

Siege of Jerusalem (AD 70)TitusVespasianRoman legion