[mvonfr]

Very interesting and highly plausible.

A more general rule can be noticed: barbarians do not create new states but are quite capable on taking over old states and changing them to serve their interests.

cf. the fall of the Roman Empire with Germanic generals initially running Roman provinces the Roman way, or the Norman conquests of parts of Europe later.

[ResisTyr]

Do some research into the origins of Islam and the Roman Catholic Church. I think you might find it "eye-opening" if not "eys-popping-out-of-your-head" 😞