July 3324 – Battle of Adrianople: Constantine I defeats Licinius, who flees to Byzantium. 987 – Hugh Capet is crowned King of France, the first of the Capetian dynasty that would rule France until the French Revolution in 1792. 1035 – William the Conqueror becomes the Duke of Normandy, reigning until 1087. 1608 – Québec City is founded by Samuel de Champlain. 1754 – French and Indian War: George Washington surrenders Fort Necessity to French forces. 1767 – Pitcairn Island is discovered by Midshipman Robert Pitcairn on an expeditionary voyage commanded by Philip Carteret.
March 1837 – Roman Senate annuls Tiberius' will and proclaims Gaius Julius Caesar Augustus Germanicus (aka Caligula = Little Boots) emperor. 1068 – An earthquake in the Levant and the Arabian Peninsula leaves up to 20,000 dead. 1229 – Frederick II, Holy Roman Emperor, declares himself King of Jerusalem in the Sixth Crusade. 1241 – First Mongol invasion of Poland: Mongols overwhelm Polish armies in Kraków in the Battle of Chmielnik and plunder the city. 1314 – Jacques de Molay, the 23rd and final Grand Master of the Knights Templar, is burned at the stake.
February 19197 – Emperor Septimius Severus defeats usurper Clodius Albinus in the Battle of Lugdunum, the bloodiest battle between Roman armies. 356 – The anti-paganism policy of Constantius II forbids the worship of pagan idols in the Roman Empire. 1594 – Having already been elected to the throne of the Polish–Lithuanian Commonwealth in 1587, Sigismund III of the House of Vasa is crowned King of Sweden, having succeeded his father John III of Sweden in 1592.
February 8421 – Constantius III becomes co-Emperor of the Western Roman Empire. 1238 – The Mongols burn the Russian city of Vladimir. 1250 – Seventh Crusade: Crusaders engage Ayyubid forces in the Battle of Al Mansurah. 1347 – The Byzantine civil war of 1341–47 ends with a power-sharing agreement between John VI Kantakouzenos and John V Palaiologos. 1575 – Leiden University is founded, and given the motto Praesidium Libertatis. 1587 – Mary, Queen of Scots, is executed on suspicion of having been involved in the Babington Plot to murder her cousin, Queen Elizabeth I.
August 22392 – Arbogast has Eugenius elected Western Roman Emperor. 851 – Battle of Jengland: Erispoe defeats Charles the Bald near the Breton town of Jengland. 1138 – Battle of the Standard between Scotland and England. 1485 – The Battle of Bosworth Field occurs; Richard III dies, marking the end of the House of Plantagenet. 1559 – Spanish archbishop Bartolomé Carranza is arrested for heresy. 1614 – Fettmilch Uprising: Jews are expelled from Frankfurt, Holy Roman Empire, following the plundering of the Judengasse.
March 10241 BC – First Punic War: Battle of the Aegates: The Romans sink the Carthaginian fleet bringing the First Punic War to an end. 298 – Roman Emperor Maximian concludes his campaign in North Africa and makes a triumphal entry into Carthage. 947 – The Later Han is founded by Liu Zhiyuan. He declares himself emperor. 1496 – After establishing the city of Santo Domingo, Christopher Columbus departs for Spain, leaving his brother in command. 1535 – Spaniard Fray Tomás de Berlanga, the fourth Bishop of Panama, discovers the Galápagos Islands by chance on his way to Peru.
May 2617 – Germanicus celebrates a triumph in Rome for his victories over the Cherusci, Chatti, and other German tribes west of the Elbe. 451 – Battle of Avarayr between Armenian rebels and the Sasanian Empire takes place. The Sasanids defeat the Armenians militarily but guarantee them freedom to openly practice Christianity. 946 – King Edmund I of England is murdered by a thief whom he personally attacks while celebrating St Augustine's Mass Day. 961 – King Otto I elects his six-year-old son Otto II as heir apparent and co-ruler of the East Frankish Kingdom.
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.
February 26747 BC – According to Ptolemy, the epoch (origin) of the Nabonassar Era began at noon on this date. Historians use this to establish the modern BC chronology for dating historic events. 364 – Valentinian I is proclaimed Roman emperor. 1266 – Battle of Benevento: An army led by Charles, Count of Anjou, defeats a combined German and Sicilian force led by Manfred, King of Sicily. Manfred is killed in the battle and Pope Clement IV invests Charles as king of Sicily and Naples.
February 27380 – Edict of Thessalonica: Emperor Theodosius I and his co-emperors Gratian and Valentinian II declare their wish that all Roman citizens convert to Nicene Christianity. 425 – The University of Constantinople is founded by Emperor Theodosius II at the urging of his wife Aelia Eudocia. 907 – Abaoji, chieftain of the Yila tribe, is named khagan of the Khitans. 1560 – The Treaty of Berwick is signed by England and the Lords of the Congregation of Scotland, establishing the terms under which English armed forces were to be permitted in Scotland in order to expel occupying French troops.
