Day In History
This Day in History
Today: May 21, 2026
293
Roman Emperors Diocletian and Maximian appoint Galerius as Caesar to Diocletian, beginning the period of four rulers known as the Tetrarchy.
878
Syracuse, Sicily, is captured by the Muslim Aghlabids after a nine-month siege.
879
Pope John VIII gives blessings to Branimir of Croatia and to the Croatian people, considered to be international recognition of the Croatian state.[1]
996
Sixteen-year-old Otto III is crowned Holy Roman Emperor.[2]
1349
Dušan's Code, the constitution of the Serbian Empire, is enacted by Dušan the Mighty.
1403
Henry III of Castile sends Ruy González de Clavijo as ambassador to Timur to discuss the possibility of an alliance between Timur and Castile against the Ottoman Empire.
1554
Queen Mary I grants a royal charter to Derby School, as a grammar school for boys in Derby, England.
1659
In the Concert of The Hague, the Dutch Republic, the Commonwealth of England and the Kingdom of France set out their views on how the Second Northern War should end.
1660
The Battle of Long Sault concludes after five days in which French colonial militia, with their Huron and Algonquin allies, are defeated by the Iroquois Confederacy.
1674
The nobility elect John Sobieski King of Poland and Grand Duke of Lithuania.
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