On This Day: March 15th

Roman consul Aulus Manlius Vulso celebrates an ovation for concluding the war against Veii and securing a forty years' truce.

The Roman Republic under its new consuls Publius Sulpicius Galba and Gaius Aurelius Cotta declares war on Philip V of Macedon, starting the Second Macedonian War.

The assassination of Julius Caesar, the dictator of the Roman Republic, by a group of senators takes place on the Ides of March.

Battle of Halmyros: The Catalan Company defeats Walter V, Count of Brienne to take control of the Duchy of Athens, a Crusader state in Greece.

Afonso I of Portugal captures in a surprise attack the city of Santarem from the Almoravids.

After a ten-year truce, German King Henry the Fowler defeats a Hungarian army at the Battle of Riade near the Unstrut river.

Al-Hadi ila'l-Haqq Yahya enters Sa'dah and founds the Zaydi Imamate of Yemen.

Michael III, emperor of the Byzantine Empire, overthrows the regency of his mother, empress Theodora (wife of Theophilos) with support of the Byzantine nobility.

Odoacer, the first barbarian King of Italy after the fall of the Western Roman Empire, is slain by Theoderic the Great, king of the Ostrogoths, while the two kings were feasting together.

Constantius Gallus is elevated as Caesar and then sent to Antioch to govern the Roman East.