📅 Today in HistoryApril 15

The Lateran Council ends by condemning the Council of Hieria and anathematizing its iconoclastic rulings.

Bari, the last Byzantine possession in southern Italy, is surrendered to Robert Guiscard.

Battle of Formigny: Toward the end of the Hundred Years' War, the French attack and nearly annihilate English forces, ending English domination in Northern France.

Battle of Rain: Swedes under Gustavus Adolphus defeat the Holy Roman Empire during the Thirty Years' War.

Irish Confederate Wars: A Confederate Irish militia is routed in the Battle of Kilrush when it attempts to halt the progress of a Royalist Army.

The Pocotaligo Massacre triggers the start of the Yamasee War in colonial South Carolina.

Foundation of the short-lived Kingdom of Corsica.

Serse, an Italian opera by George Frideric Handel, receives its premiere performance in London, England.

Samuel Johnson's A Dictionary of the English Language is published in London.

Thomas Hopkins Gallaudet and Laurent Clerc found the American School for the Deaf (then called the Connecticut Asylum for the Education and Instruction of Deaf and Dumb Persons), the first American school for deaf students, in Hartford, Connecticut.