Michael III

Michael III (1601 - 1663) was the King of Prussia from 1618 until his death. After the unexpected death of his father Wilhelm I in 1618, the young Michael ascended the throne at the age of 17. No King Regent was provided to Michael III as his 18th birthday was only a few weeks away. Michael III was the King who provided Royal Assent to the Constitution Act, 1653.

He is the namesake of the Order of King Michael III, an order of Chivalry founded in 1701 to mark the King's would be 100th Birthday.