Rise and Fall of Roman Tetrarchy (+ 11 more historical events on this day!)
A Daily Dose of History: Events on this Day in History
- Published
- May 21, 2026
- Duration
- 8:29
- Summary source
- description
- Last updated
- Jul 5, 2026
Discusses A Daily Dose of History (21 May 2026) Today's historical events: Roman Emperors Diocletian and Maxim…
Summary
A Daily Dose of History (21 May 2026) 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 Croati…
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Show notes
A Daily Dose of History (21 May 2026) 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 international recognition of the Croatian state. Sixteen-year-old Otto III is crowned Holy Roman Emperor. Dušan's C