📅 Today in HistoryMarch 4

Nero, later to become Roman emperor, is given the title princeps iuventutis (head of the youth).

Martyrdom of Saint Adrian of Nicomedia.

Yang Jian declares himself Emperor Wen of Sui, ending the Northern Zhou and beginning the Sui dynasty.

Croatian Knez Trpimir I issues a statute, a document with the first known written mention of the Croats name in Croatian sources.

Translation of the relics of martyr Wenceslaus I, Duke of Bohemia, Prince of the Czechs.

Frederick I Barbarossa is elected King of Germany.

The Battle of the Sit River begins two centuries of Mongol horde domination of Rus.

Ramathibodi becomes King of Siam.

Władysław II Jagiełło (Jogaila) is crowned King of Poland.

Wars of the Roses in England: Lancastrian King Henry VI is deposed by his House of York cousin, who then becomes King Edward IV.