September 21, 1327 - The deposed Edward II was murdered in Berkeley Castle, some say by order of his wife, to ensure the succession of his son Edward III.
September 21, 1411 – Richard Plantagenet, 3rd Duke of York, was born. The Duke was a claimant to the English throne and father of Edward IV and Richard III.
September 21, 1937 - J.R.R. Tolkien publishes The Hobbit.