Tetrarchy: Roman Empire's New Era (+ 13 more historical events on this day!)
May 20 2024
10 mins
A Daily Dose of History (21 May 2024) Today's historical events: Roman Emperors Diocletian and Maximian appoint Galerius as Caesar to Diocletian, beginning the period of four rulers known as the Tetrarchy. Syracuse, Sicily, is captured by the Muslim Aghlabids after a nine-month siege. Pope John VIII gives blessings to Branimir of Croatia and to the Croatian people, considered to be