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Concept
May 21
Summary
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.
996 – Sixteen-year-old Otto III is crowned Holy Roman Emperor.
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.
1703 – Daniel Defoe is imprisoned on charges of seditious libel.
1725 – The Order of St. Alexander Nevsky is instituted in Russia by Empress Catherine I. It would later be discontinued and then reinstated by the Soviet government in 1942 as the Order of Alexander Nevsky.
1758 – Ten-year-old Mary Campbell is abducted in Pennsylvania by Lenape during the French and Indian War. She is returned six and a half years later.
1792 – A lava dome collapses on Mount Unzen, near the city of Shimbara on the Japanese island of Kyūshū, creating a deadly tsunami that killed nearly 15,000 people.
1809 – The first day of the Battle of Aspern-Essling between the Austrian army led by Archduke Charles and the French army led by Napoleon I of France sees the French attack across the Danube held.
Official source
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