April 1521

Thursday 07:

Ferdinand Magellan arrives at Cebu

Saturday 16:

Martin Luther's first appearance before the Diet of Worms to be examined by the Holy Roman Emperor Charles V and the rest of the estates of the empire.

Sunday 17:

Martin Luther speaks to the assembly at the Diet of Worms, refusing to recant his teachings.

Saturday 23:

Battle of Villalar: King Charles I of Spain defeats the Comuneros.

Wednesday 27:

Battle of Mactan: Explorer Ferdinand Magellan is killed by natives in the Philippines led by chief Lapu-Lapu.