January 23393 – Roman emperor Theodosius I proclaims his eight-year-old son Honorius co-emperor. 971 – Using crossbows, Song dynasty troops soundly defeat a war elephant corps of the Southern Han at Shao. 1264 – In the conflict between King Henry III of England and his rebellious barons led by Simon de Montfort, King Louis IX of France issues the Mise of Amiens, a one-sided decision in favour of Henry that later leads to the Second Barons' War.
July 18477 BC – Battle of the Cremera as part of the Roman–Etruscan Wars. Veii ambushes and defeats the Roman army. 387 BC – Roman-Gaulish Wars: Battle of the Allia: A Roman army is defeated by raiding Gauls, leading to the subsequent sacking of Rome. 362 – Roman–Persian Wars: Emperor Julian arrives at Antioch with a Roman expeditionary force (60,000 men) and stays there for nine months to launch a campaign against the Persian Empire. 452 – Sack of Aquileia: After an earlier defeat on the Catalaunian Plains, Attila lays siege to the metropolis of Aquileia and eventually destroys it.
March 1509 BC – Publius Valerius Publicola celebrates the first triumph of the Roman Republic after his victory over the deposed king Lucius Tarquinius Superbus at the Battle of Silva Arsia. 293 – Emperor Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This is considered the beginning of the Tetrarchy, known as the Quattuor Principes Mundi ("Four Rulers of the World"). 350 – Vetranio proclaims himself Caesar after being encouraged to do so by Constantina, sister of Constantius II.
March 3473 – Gundobad (nephew of Ricimer) nominates Glycerius as emperor of the Western Roman Empire. 724 – Empress Genshō abdicates the throne in favor of her nephew Shōmu who becomes emperor of Japan. 1575 – Mughal Emperor Akbar defeats Sultan of Bengal Daud Khan Karrani's army at the Battle of Tukaroi. 1585 – The Olympic Theatre, designed by Andrea Palladio, is inaugurated in Vicenza. 1776 – American Revolutionary War: The first amphibious landing of the United States Marine Corps begins the Battle of Nassau.
February 15438 – Roman emperor Theodosius II publishes the law codex Codex Theodosianus 590 – Khosrau II is crowned king of Persia. 706 – Byzantine emperor Justinian II has his predecessors Leontios and Tiberios III publicly executed in the Hippodrome of Constantinople. 1002 – At an assembly at Pavia of Lombard nobles, Arduin of Ivrea is restored to his domains and crowned King of Italy. 1113 – Pope Paschal II issues Pie Postulatio Voluntatis, recognizing the Order of Hospitallers.
July 17180 – Twelve inhabitants of Scillium (near Kasserine, modern-day Tunisia) in North Africa are executed for being Christians. This is the earliest record of Christianity in that part of the world. 1048 – Damasus II is elected pope, and dies 23 days later. 1203 – The Fourth Crusade assaults Constantinople. The Byzantine emperor Alexios III Angelos flees from his capital into exile. 1402 – Zhu Di, better known by his era name as the Yongle Emperor, assumes the throne over the Ming dynasty of China.
1764January 7 – The Siculicidium is carried out as hundreds of the Székely minority in Transylvania are massacred by the Austrian Army at Madéfalva. January 19 – John Wilkes is expelled from the House of Commons of Great Britain, for seditious libel. February 15 – The settlement of St. Louis is established. March 15 – The day after his return to Paris from a nine-year mission, French explorer and scholar Anquetil Du Perron presents a complete copy of the Zoroastrian sacred text, the Zend Avesta, to the Bibliothèque Royale in Paris, along with several other traditional texts.
1814January 1 – War of the Sixth Coalition – The Royal Prussian Army led by Gebhard Leberecht von Blücher crosses the Rhine. January 3 War of the Sixth Coalition – Siege of Cattaro: French garrison surrenders to the British after ten days of bombardment. War of the Sixth Coalition – Siege of Metz: Allied armies lay siege to the French city and fortress of Metz. January 5 – Mexican War of Independence – Battle of Puruarán: Spanish Royalists defeat Mexican Rebels.
April 4503 BC – Roman consul Agrippa Menenius Lanatus celebrates a triumph for a military victory over the Sabines. 190 – Dong Zhuo has his troops evacuate the capital Luoyang and burn it to the ground. 611 – Maya king Uneh Chan of Calakmul sacks rival city-state Palenque in southern Mexico. 801 – King Louis the Pious captures Barcelona from the Moors after a siege of several months. 1268 – A five-year Byzantine–Venetian peace treaty is concluded between Venetian envoys and Emperor Michael VIII Palaiologos.
August 20AD 14 – Agrippa Postumus, maternal grandson of the late Roman emperor Augustus, is mysteriously executed by his guards while in exile. 636 – Battle of Yarmouk: Arab forces led by Khalid ibn al-Walid take control of the Levant away from the Byzantine Empire, marking the first great wave of Muslim conquests and the rapid advance of Islam outside Arabia. 917 – Battle of Acheloos: Tsar Simeon I of Bulgaria decisively defeats a Byzantine army. 1083 – Canonization of the first King of Hungary, Saint Stephen and his son Saint Emeric celebrated as a National Day in Hungary.
