William Coffin was a Gentleman on the Privy Chamber to what King of England from 1509-1547?
William Coffin (courtier):  He was a Gentleman of the Privy Chamber to King Henry VIII and Master of the Horse to Queen Jane Seymour. Henry VIII of England: Henry VIII (28 June 1491 – 28 January 1547) was King of England from 21 April 1509 until his death.
Henry VIII