Byzantine Empire - The Tetrarchy systems
Time: 293
Place: Roman Empire
Details: An early instance of the partition of the Empire into East and West occurred in 293 when Emperor Diocletian created a new administrative system (the tetrarchy), to guarantee security in all endangered regions of his Empire. He associated himself with a co-emperor (Augustus), and each co-emperor then adopted a young colleague given the title of Caesar, to share in their rule and eventually to succeed the senior partner. Each tetrarch was in charge of a part of the Empire.
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