350 – The Roman usurper Nepotianus, of the Constantinian dynasty, proclaims himself Roman emperor, entering Rome at the head of a group of gladiators.
713 – The Byzantine emperor Philippicus is blinded, deposed and sent into exile by conspirators of the Opsikion army in Thrace. He is succeeded by Anastasios II, who begins the reorganization of the Byzantine army.
1098 – After a five-month siege during the First Crusade, the Crusaders seize Antioch (today's Turkey).
1140 – The French scholar Peter Abelard is found guilty of heresy.
1326 – The Treaty of Novgorod delineates borders between Russia and Norway in Finnmark.
1539 – Hernando de Soto claims Florida for Spain.
1602 – An English naval force defeats a fleet of Spanish galleys, and captures a large Portuguese carrack at the Battle of Sesimbra Bay
1608 – Samuel de Champlain lands at Tadoussac, Quebec, in the course of his third voyage to New France, and begins erecting fortifications.
1621 – The Dutch West India Company receives a charter for New Netherland.
1658 – Pope Alexander VII appoints François de Laval vicar apostolic in New France.
1665 – James Stuart, Duke of York (later to become King James II of England), defeats the Dutch fleet off the coast of Lowestoft.
1781 – Jack Jouett begins his midnight ride to warn Thomas Jefferson and the Virginia legislature of an impending raid by Banastre Tarleton.
1839 – In Humen, China, Lin Tse-hsü destroys 1.2 million kilograms of opium confiscated from British merchants, providing Britain with a casus belli to open hostilities, resulting in the First Opium War.
1844 – The last pair of great auks is killed.
1861 – American Civil War: Battle of Philippi (also called the Philippi Races): Union forces rout Confederate troops in Barbour County, Virginia, now West Virginia.
1864 – American Civil War: Battle of Cold Harbor: Union forces attack Confederate troops in Hanover County, Virginia.
1866 – The Fenians are driven out of Fort Erie, Ontario back into the United States.