John II, duke of Brittany (born 1239)

John II reigned as Duke of Brittany from 1286 until his death, and was also Earl of Richmond in the Peerage of England. He took part in two crusades prior to his accession to the ducal throne. As a duke, John was involved in the conflicts between the kings of France and England. He was crushed to death in an accident during the celebrations of a papal coronation.