7. William the Conqueror: $ 229 billion (216 billion euros)
Also known as William the Bastard, William II of Normandy and finally William I of England, he is Duke of Normandy from 1035 to his death and King of England from 1066 until his death in 1087. In addition to taxes, possessions King William the Conqueror are increased by large properties it owns throughout England. As heir of King Edward, he controls all the royal domains, and adds much of the land of Harold and his family, making it the largest owner of the kingdom (by far) to the end of his reign, his lands in England are four times greater than those of his half-brother Odo, the largest owner after him, and seven times more than those of Roger de Montgomery. A recent study of William the 7th richest man who ever lived.