30 BC – Octavian (later known as Augustus) enters Alexandria, Egypt, bringing it under the control of the Roman Republic. AD 69 – Batavian rebellion: The Batavians in Germania Inferior (Netherlands) revolt under the leadership of Gaius Julius Civilis. 527 – Justinian I becomes the sole ruler of the Byzantine Empire. 607 – Ono no Imoko is dispatched as envoy to the Sui court in China (Traditional Japanese date: July 3, 607). 902 – Taormina, the last Byzantine stronghold in Sicily, is captured by the Aghlabid army, concluding the Muslim conquest of Sicily. 1203 – Isaac II Angelos, restored Byzantine Emperor, declares his son Alexios IV Angelos co-emperor after pressure from the forces of the Fourth Crusade. 1291 – The Old Swiss Confederacy is formed with the signature of the Federal Charter. 1469 – Louis XI of France founds the chivalric order called the Order of Saint Michael in Amboise. 1498 – Christopher Columbus becomes the first European to visit what is now Venezuela. 1571 – The Ottoman conquest of Cyprus is concluded, by the surrender of Famagusta. 1620 – Speedwell leaves Delfshaven to bring pilgrims to America by way of England. 1664 – Ottoman forces are defeated in the battle of Saint Gotthard by an Austrian army led by Raimondo Montecuccoli, resulting in the Peace of Vasvár. 1714 – George, Elector of Hanover, becomes King George I of Great Britain, marking the beginning of the Georgian era of British history. 1759 – Seven Years' War: The Battle of Minden, an allied Anglo-German army victory over the French. In Britain this was one of a number of events that constituted the Annus Mirabilis of 1759 and is celebrated as Minden Day by certain British Army regiments. 1774 – British scientist Joseph Priestley discovers oxygen gas, corroborating the prior discovery of this element by German-Swedish chemist Carl Wilhelm Scheele. 1798 – French Revolutionary Wars: Battle of the Nile (Battle of Aboukir Bay): Battle begins when a British fleet engages the French Revolutionary Navy fleet in an unusual night action.