The Rise of the Samurai
After the warrior clans of Japan fought each other to a conclusion, the victor took the title of shogun and set up a military government at Kamakura, leaving the emperor in Kyoto with his rituals and no power. Japan kept an emperor continuously for the next seven centuries and was ruled by soldiers for almost all of it. It is an unusually clean case of a state splitting legitimacy from authority — the sacred figure who reigns, the warrior who governs — and finding that the arrangement is more durable than either alone.
A durable new order — a state, an institution, a system of rule — is deliberately built and consolidated, outlasting the people who founded it.