Births on June 20

Gian Galeazzo Sforza, Duke of Milan (d. 1494)

Gian Galeazzo Sforza (20 June 1469 – 21 October 1494), also known as Giovan Galeazzo Sforza, was the sixth Duke of Milan.

26 Jul

Battle of Edgecote Moor
Wars of the Roses: The Battle of Edgecote Moor, pitting the forces of Richard Neville, 16th Earl of Warwick against those of Edward IV of England, takes place.
1 Aug

Order of Saint Michael
Louis XI of France founds the chivalric order called the Order of Saint Michael in Amboise.
19 Oct

Isabella I of Castile
Ferdinand II of Aragon marries Isabella I of Castile, a marriage that paves the way to the unification of Aragon and Castile into a single country, Spain.