Everything was formed around the king/lord.The king owned the land.The serfs would trade services for housing and safety.Serfs/Peasants were at the bottom of the "Pyramid"it then it was the Knights,Nobles then King at the very top.
D. Lack of a clearly designated successor to the imperial throne. During the decline of the empires, the succession of the throne became a contest between family members. Hope this helps.
