Battle of Mantinea: The Thebans, led by Epaminondas, defeated the Spartans.
414
Emperor Theodosius II, age 13, yields power to his older sister Aelia Pulcheria, who reigned as regent and proclaimed herself empress (Augusta) of the Eastern Roman Empire.
836
Pactum Sicardi, a peace treaty between the Principality of Benevento and the Duchy of Naples, is signed.
993
Ulrich of Augsburg is canonized as a saint.
1054
A supernova, called SN 1054, is seen by Chinese Song dynasty, Arab, and possibly Amerindian observers near the star Zeta Tauri. For several months it remains bright enough to be seen during the day. Its remnants form the Crab Nebula.
1120
Jordan II of Capua is anointed as prince after his infant nephew's death.