11. Alain Roux 179 billion (169 billion euros)
Born in 1040 and died August 4, 1093, Alain Roux was a Breton noble who participated in the Norman conquest of England and became one of the richest barons through many lands in England. In a book called The Richest of the Rich (in French “the richest of the rich”), Philip Beresford and William D. Rubinstein appoint Alain Roux as the richest person in England for all time.