<Tr> <Td> Harold Sacramentum Fecit Willelmo Duci (Bayeux Tapestry) </Td> </Tr> <Tr> <Td> Fief </Td> </Tr> <Tr> <Td> <Ul> <Li> Overlord </Li> <Li> Vassal </Li> </Ul> </Td> </Tr> <Ul> <Li> Overlord </Li> <Li> Vassal </Li> </Ul>

When did the feudal system start in medieval europe