Deaths on September 23

John Jewel, English bishop (b. 1522)

John Jewel (alias Jewell) (24 May 1522 – 23 September 1571) of Devon, England was Bishop of Salisbury from 1559 to 1571.

11 Jan

Freedom of religion
Austrian nobility is granted freedom of religion.
7 Sep

Ridolfi plot
Thomas Howard, 4th Duke of Norfolk, is arrested for his role in the Ridolfi plot to assassinate Queen Elizabeth I of England and replace her with Mary, Queen of Scots.