I think the word you are looking for is Constantine.
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Popular sovereignty is the basis for federalism. Without popular sovereignty there could be no federalism. All just political power originates in the people. They delegate some of it to governments at all levels through constitutions
The "Middle Ages" or medieval period generally refers to the entire time span between classical antiquity and the modern era in Western history. The Middle Ages lasted approximately AD 500 - 1500, from the fall of the (Western) Roman Empire to the fall of the Byzantine Empire and the discovery and colonization of the New World. The Middle Ages are often partitioned into the Early, High, and Late Middle Ages.
