 Given these premises, it was believed in the court of Frederick I that the Empire, established directly by divine will as a form of political organization of humanity, was sacred.The expression "Sacrum Imperium" appears for the first time in a document of 1157.In a different plane, it cannot be forgotten that the 12th century saw the beginning of the revitalization of the monarchic power over feudalism, after several centuries of deep decay of the royal authority.