Classical feudal lords were only tied to the existence of a domain to exploit ~ just like modern trasnational corporations, they were only tied to any particular domain by the lack of an opportunity to gain a better domain somewhere else and if, as when William of Normandy decided that England looked like a tasty morsel ripe for the plucking, new more lucrative domains opened up, they very readily picked up and moved to take on new titles in new lands.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.