August 25

19 – The Roman general Germanicus dies near Antioch. He was convinced that the mysterious illness that ended in his death was a result of poisoning by the Syrian governor Gnaeus Calpurnius Piso, whom he had ordered to leave the province. 766 – Emperor Constantine V humiliates nineteen high-ranking officials, after discovering a plot against him. He executes the leaders, Constantine Podopagouros and his brother Strategios. 1248 – The Dutch city of Ommen receives city rights and fortification rights from Otto III, the Archbishop of Utrecht. 1258 – Regent George Mouzalon and his brothers are killed during a coup headed by the aristocratic faction under Michael VIII Palaiologos, paving the way for its leader to ultimately usurp the throne of the Empire of Nicaea. 1270 – Philip III, although suffering from dysentery, becomes King of France following the death of his father Louis IX, during the Eighth Crusade. His uncle, Charles I of Naples, is forced to begin peace negotiations with Muhammad I al-Mustansir, Hafsid Sultan of Tunis. 1537 – The Honourable Artillery Company, the oldest surviving regiment in the British Army, and the second most senior, is formed. 1543 – António Mota and a few companions become the first Europeans to visit Japan. 1580 – War of the Portuguese Succession: Spanish victory at the Battle of Alcântara brings about the Iberian Union. 1609 – Galileo Galilei demonstrates his first telescope to Venetian lawmakers. 1630 – Portuguese forces are defeated by the Kingdom of Kandy at the Battle of Randeniwela in Sri Lanka. 1758 – Seven Years' War: Frederick II of Prussia defeats the Russian army at the Battle of Zorndorf. 1814 – War of 1812: On the second day of the Burning of Washington, British troops torch the Library of Congress, United States Treasury, Department of War, and other public buildings. 1823 – American fur trapper Hugh Glass is mauled by a grizzly bear while on an expedition in South Dakota. 1825 – The Thirty-Three Orientals declare the independence of Uruguay from Brazil.