The Roman Tetrarchy and the Rule of Four - ThoughtCo
https://www.thoughtco.com/definition-of-tetrarchy-120830
WEBFeb 4, 2020 · N.S. Gill. Updated on February 04, 2020. The word Tetrarchy means "rule of four." It derives from the Greek words for four ( tetra-) and rule ( arch- ). In practice, the word refers to …
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