ancientart: On this day in AD 293: Roman Emperors Diocletian and Maximian appointed Galerius, beginning the period of four rulers known as the Tetrarchy. 

ancientart: On this day in AD 293: Roman Emperors Diocletian and Maximian appointed Galerius, beginning the period of four rulers known as the Tetrarchy. 

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from: http://juxtudruhh.tumblr.com/post/51847322793