July 6371 BC – The Battle of Leuctra shatters Sparta's reputation of military invincibility. 640 – Battle of Heliopolis: The Muslim Arab army under 'Amr ibn al-'As defeat the Byzantine forces near Heliopolis (Egypt). 1253 – Mindaugas is crowned King of Lithuania. 1348 – Pope Clement VI issues a papal bull protecting the Jews accused of having caused the Black Death. 1411 – Ming China's Admiral Zheng He returns to Nanjing after the third treasure voyage and presents the Sinhalese king, captured during the Ming–Kotte War, to the Yongle Emperor.
September 25275 – For the last time, the Roman Senate chooses an emperor; they elect 75-year-old Marcus Claudius Tacitus. 762 – Led by Muhammad al-Nafs al-Zakiyya, the Hasanid branch of the Alids begins the Alid Revolt against the Abbasid Caliphate. 1066 – In the Battle of Stamford Bridge, Harald Hardrada, the invading King of Norway, is defeated by King Harold II of England. 1237 – England and Scotland sign the Treaty of York, establishing the location of their common border.
October 211096 – A Seljuk Turkish army successfully fights off the People's Crusade. 1097 – First Crusade: Crusaders led by Godfrey of Bouillon, Bohemund of Taranto, and Raymond IV, Count of Toulouse, begin the Siege of Antioch. 1392 – Japanese Emperor Go-Kameyama abdicates in favor of rival claimant Go-Komatsu. 1512 – Martin Luther joins the theological faculty of the University of Wittenberg. 1520 – João Álvares Fagundes discovers the islands of Saint Pierre and Miquelon, bestowing them their original name of "Islands of the 11,000 Virgins".
February 2506 – Alaric II, eighth king of the Visigoths, promulgates the Breviary of Alaric (Breviarium Alaricianum or Lex Romana Visigothorum), a collection of "Roman law". 880 – Battle of Lüneburg Heath: King Louis III of France is defeated by the Norse Great Heathen Army at Lüneburg Heath in Saxony. 962 – Translatio imperii: Pope John XII crowns Otto I, Holy Roman Emperor, the first Holy Roman Emperor in nearly 40 years. 1032 – Conrad II, Holy Roman Emperor becomes king of Burgundy.
April 29801 – An earthquake in the Central Apennines hits Rome and Spoleto, damaging the basilica of San Paolo Fuori le Mura. 1091 – Battle of Levounion: The Pechenegs are defeated by Byzantine Emperor Alexios I Komnenos. 1386 – Battle of the Vikhra River: The Principality of Smolensk is defeated by the Grand Duchy of Lithuania and becomes its vassal. 1429 – Joan of Arc arrives to relieve the Siege of Orléans. 1483 – Gran Canaria, the main island of the Canary Islands, is conquered by the Kingdom of Castile.
September 1985 – Nerva, suspected of complicity of the death of Domitian, is declared emperor by Senate. The Senate then annuls laws passed by Domitian and orders his statues to be destroyed. 634 – Siege of Damascus: The Rashidun Arabs under Khalid ibn al-Walid capture Damascus from the Byzantine Empire. 1356 – Battle of Poitiers: An English army under the command of Edward the Black Prince defeats a French army and captures King John II. 1410 – End of the Siege of Marienburg: The State of the Teutonic Order repulses the joint Polish—Lithuanian forces.
November 15655 – Battle of the Winwaed: Penda of Mercia is defeated by Oswiu of Northumbria. 1315 – Growth of the Old Swiss Confederacy: The Schweizer Eidgenossenschaft ambushes the army of Leopold I in the Battle of Morgarten. 1532 – Spanish conquest of the Inca Empire: Commanded by Francisco Pizarro, Spanish conquistadors under Hernando de Soto meet Incan Emperor Atahualpa for the first time outside Cajamarca, arranging for a meeting in the city plaza the following day. 1533 – Francisco Pizarro arrives in Cuzco, the capital of the Inca Empire.
February 121096 – Pope Urban II confirms the foundation of the abbey of La Roë under Robert of Arbrissel as a community of canons regular. 1404 – The Italian professor Galeazzo di Santa Sophie performed the first post-mortem autopsy for the purposes of teaching and demonstration at the Heiligen–Geist Spital in Vienna. 1429 – English forces under Sir John Fastolf defend a supply convoy carrying rations to the army besieging Orléans in the Battle of the Herrings.
April 8217 – Roman emperor Caracalla is assassinated and is succeeded by his Praetorian Guard prefect, Marcus Opellius Macrinus. 876 – The Battle of Dayr al-'Aqul saves Baghdad from the Saffarids. 1139 – Roger II of Sicily is excommunicated by Innocent II for supporting Anacletus II as pope for seven years, even though Roger had already publicly recognized Innocent's claim to the papacy. 1232 – Mongol–Jin War: The Mongols begin their siege on Kaifeng, the capital of the Jin dynasty.
October 5610 – Heraclius arrives at Constantinople, kills Byzantine Emperor Phocas, and becomes emperor. 816 – King Louis the Pious is crowned emperor of the Holy Roman Empire by the Pope. 869 – The Fourth Council of Constantinople is convened to depose patriarch Photios I. 1143 – With the signing of the Treaty of Zamora, King Alfonso VII of León and Castile recognises Portugal as a Kingdom. 1450 – Louis IX, Duke of Bavaria expels Jews from his jurisdiction. 1607 – Assassins attempt to kill Venetian statesman and scientist Paolo Sarpi.
