April 13, 655 (traditional date): Martin, pope from 649 to 655, dies in banishment. History remembers him as the last pope venerated as a martyr.

April 13, 1534: Sir Thomas More, Lord Chancellor of England, refuses to take the oath to the English succession. One year later, Henry VIII indicted him for treason and had him beheaded.

April 13, 1598: France's Henry IV signs the Edict of Nantes, granting extensive political rights to the Huguenots (a Protestant group he once belonged to). The Huguenots ...