379 Theodosius installed as co-emperor of East Roman Empire.
973 Pope Benedictus VI elected
1419 The French city of Rouen surrendered to Henry V in Hundred Years War.
1520 Sten Sture the Younger, the Regent of Sweden, was mortally wounded at the Battle of Bogesund, an important conflict in the campaign of Christian II to gain power over Sweden.
1523 Ulrich Zwingli, founder of the reformation in Switzerland, published his 67 Articles, the first manifesto of the Zurich Reformation which attacks the authority of the Pope.
1783 William Pitt became the youngest Prime Minister of England at age 24.