March 15474 BC – Roman consul Aulus Manlius Vulso celebrates an ovation for concluding the war against Veii and securing a forty years truce. 44 BC – The assassination of Julius Caesar takes place on the Ides of March. 493 – Odoacer, the first barbarian King of Italy after the fall of the Western Roman Empire, is slain by Theoderic the Great, king of the Ostrogoths, while the two kings were feasting together. 856 – Michael III, emperor of the Byzantine Empire, overthrows the regency of his mother, empress Theodora (wife of Theophilos) with support of the Byzantine nobility.
March 4AD 51 – Nero, later to become Roman emperor, is given the title princeps iuventutis (head of the youth). 306 – Martyrdom of Saint Adrian of Nicomedia. 852 – Croatian Knez Trpimir I issues a statute, a document with the first known written mention of the Croats name in Croatian sources. 938 – Translation of the relics of martyr Wenceslaus I, Duke of Bohemia, Prince of the Czechs. 1152 – Frederick I Barbarossa is elected King of Germany. 1238 – The Battle of the Sit River begins two centuries of Mongol horde domination of Russia.
October 25285 or 286 – Execution of Saints Crispin and Crispinian during the reign of Diocletian, now the patron saints of leather workers, curriers, and shoemakers. 473 – Emperor Leo I acclaims his grandson Leo II as Caesar of the East Roman Empire. 1147 – Seljuk Turks defeat German crusaders under Conrad III at the Battle of Dorylaeum. 1147 – Reconquista: After a siege of four months, crusader knights reconquer Lisbon. 1415 – Hundred Years' War: Henry V of England, with his lightly armoured infantry and archers, defeats the heavily armoured French cavalry in the Battle of Agincourt.
February 9474 – Zeno is crowned as co-emperor of the Byzantine Empire. 1003 – Boleslaus III is restored to authority with armed support from Bolesław I the Brave of Poland. 1098 – The army of the First Crusade under the leadership of Bohemond of Taranto wins a battle against Seljuq emir Ridwan of Aleppo during the siege of Antioch 1539 – The first recorded race is held on Chester Racecourse, known as the Roodee. 1555 – Bishop of Gloucester John Hooper is burned at the stake. 1621 – Gregory XV becomes Pope, the last Pope elected by acclamation.
July 4362 BC – Battle of Mantinea: The Thebans, led by Epaminondas, defeated the Spartans. 414 – Emperor Theodosius II, age 13, yields power to his older sister Aelia Pulcheria, who reigned as regent and proclaimed herself empress (Augusta) of the Eastern Roman Empire. 836 – Pactum Sicardi, a peace treaty between the Principality of Benevento and the Duchy of Naples, is signed. 993 – Ulrich of Augsburg is canonized as a saint. 1054 – A supernova, called SN 1054, is seen by Chinese Song dynasty, Arab, and possibly Amerindian observers near the star Zeta Tauri.
September 12490 BC – Battle of Marathon: The conventionally accepted date for the Battle of Marathon. The Athenians and their Plataean allies defeat the first Persian invasion force of Greece. 372 – Sixteen Kingdoms: Jin Xiaowudi, age 10, succeeds his father Jin Jianwendi as Emperor of the Eastern Jin dynasty. 1213 – Albigensian Crusade: Simon de Montfort, 5th Earl of Leicester, defeats Peter II of Aragon at the Battle of Muret. 1229 – Battle of Portopí: The Aragonese army under the command of James I of Aragon disembarks at Santa Ponça, Majorca, with the purpose of conquering the island.
October 2897 – Roman emperor Nerva is forced by the Praetorian Guard to adopt general Marcus Ulpius Trajanus as his heir and successor. 306 – Maxentius is proclaimed Roman emperor. 312 – Constantine I defeats Maxentius, becoming the sole Roman emperor in the West. 969 – The Byzantine Empire recovers Antioch from Arab rule. 1344 – The lower town of Smyrna is captured by Crusaders in response to Aydınid piracy. 1420 – Beijing is officially designated the capital of the Ming dynasty when the Forbidden City is completed.
October 6105 BC – Cimbrian War: Defeat at the Battle of Arausio of the Roman army of the mid-Republic 69 BC – Third Mithridatic War: The military of the Roman Republic subdue Armenia. AD 23 – Rebels decapitate Wang Mang two days after his capital was sacked during a peasant rebellion. 404 – Byzantine Empress Eudoxia dies from the miscarriage of her seventh pregnancy. 618 – Transition from Sui to Tang: Wang Shichong decisively defeats Li Mi at the Battle of Yanshi. 1539 – Spain's DeSoto expedition takes over the Apalachee capital of Anhaica for their winter quarters.
September 2961 BC – Pompey the Great celebrates his third triumph for victories over the pirates and the end of the Mithridatic Wars on his 45th birthday. 1011 – Danes capture Canterbury after a siege, taking Ælfheah, archbishop of Canterbury, as a prisoner. 1227 – Frederick II, Holy Roman Emperor, is excommunicated by Pope Gregory IX for his failure to participate in the Crusades during the Investiture Controversy. 1267 – The Treaty of Montgomery recognises Llywelyn ap Gruffudd as Prince of Wales, but only as a vassal of King Henry III.
March 31307 – After divorcing his wife Minervina, Constantine marries Fausta, daughter of the retired Roman emperor Maximian. 1146 – Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis VII is present, and joins the Crusade. 1492 – Queen Isabella of Castile issues the Alhambra Decree, ordering her 150,000 Jewish and Muslim subjects to convert to Christianity or face expulsion. 1521 – Ferdinand Magellan and fifty of his men came ashore to present-day Limasawa to participate in the first Catholic mass in the Philippines.
