It is sufficient simply to single out for mention his most important contribution, the clan inheritance system known as tsung fa. Under this system, succession passes to the eldest son by the principal wife. Younger sons or sons by concubines become founders of their own noble houses. Thus the feudal lord stands to the king in a double relationship. In terms of political relationship he is a vassal while in terms of blood ties he is the head of a cadet branch of the royal clan. Political allegiance has as its foundation family allegiance. This social system founded by the Duke of Chou proved
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