1456    Ulrich II of Celje (Slovene: Ulrik Celjski, German Ulrich von Cilli, Hungarian: Cillei Ulrik), last prince of Celje principality, was assassinated in Belgrade.

1555    The Peace of Augsburg is signed in Augsburg by Charles V and the princes of the Schmalkaldic League.

1745    Battle of Prestonpans: A Hanoverian army under the command of Sir John Cope is defeated, in ten minutes, by the Jacobite forces of Prince Charles Edward Stuart

1794    Allies under the prince of Coburg defeat French forces at Le Cateau.

1949    Rainier III of Monaco becomes Prince of Monaco.

1991    Cambodian Prince Norodom Sihanouk returns to Phnom Penh after thirteen years of exile.

1993    Liechtenstein Prince Hans-Adam II disbands Parliament