Years: 1451 1452 1453 - 1454 - 1455 1456 1457

Decades: 1420s 1430s 1440s - 1450s - 1460s 1470s 1480s

Centuries: 14th century - 15th century - 16th century

Events

• February 4 - In the Thirteen Years' War, the Secret Council of the Prussian Confederacy sends a formal act of disobedience to the Grand Master.

• March 6 - Casimir IV of Poland renounces allegiance to the Teutonic Knights
• March 27 - Richard Plantagenet, Duke of York becomes Protector for the insane King Henry VI of England
• September 18 - In the battle of Chojnice, the Polish army is defeated by a smaller but more professional Teutonic army during Thirteen Years' War.
• December - King Henry having regained his sanity, the Duke of York is dismissed as Protector
• Francesco Sforza forms a triple alliance between the duchy of Milan, republic of Florence and kingdom of Naples

Births

• March 9 - Amerigo Vespucci, explorer and cartographer (d. 1512)

Deaths

• John Kemp, Archbishop of Canterbury