Births on April 23

Johann Stumpf, Swiss writer (d. 1576)

Johann Stumpf (23 April 1500 – c. 1578) was an early writer on the history and topography of Switzerland as well as a theologian and cartographer.

17 Feb

Battle of Hemmingstedt
Duke Friedrich and Duke Johann attempt to subdue the peasantry of Dithmarschen, Denmark, in the Battle of Hemmingstedt.
9 Mar

Treaty of Tordesillas
The fleet of Pedro Álvares Cabral leaves Lisbon for the Indies. The fleet will discover Brazil which lies within boundaries granted to Portugal in the Treaty of Tordesillas.
29 Mar

Rodrigo Borgia
Cesare Borgia is given the title of Captain General and Gonfalonier by his father Rodrigo Borgia after returning from his conquests in the Romagna.