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Concept
May 20
Summary
325 – The First Council of Nicaea is formally opened, starting the first ecumenical council of the Christian Church.
491 – Empress Ariadne marries Anastasius I. The widowed Augusta is able to choose her successor for the Byzantine throne, after Zeno (late emperor) dies of dysentery.
685 – The Battle of Dun Nechtain is fought between a Pictish army under King Bridei III and the invading Northumbrians under King Ecgfrith, who are decisively defeated.
794 – While visiting the royal Mercian court at Sutton Walls with a view to marrying princess Ælfthryth, King Æthelberht II of East Anglia is taken captive and beheaded.
1217 – The Second Battle of Lincoln is fought near Lincoln, England, resulting in the defeat of Prince Louis of France by William Marshal, 1st Earl of Pembroke.
1293 – King Sancho IV of Castile creates the Estudio de Escuelas de Generales in Alcalá de Henares.
1426 – King Mohnyin Thado formally ascends to the throne of Ava.
1449 – The Battle of Alfarrobeira is fought, establishing the House of Braganza as a principal royal family of Portugal.
1497 – John Cabot sets sail from Bristol, England, on his ship looking for a route to the west (other documents give a May 2 date).
1498 – Portuguese explorer Vasco da Gama discovers the sea route to India when he arrives at Kozhikode (previously known as Calicut), India.
1520 – Hernan Cortés defeats Pánfilo de Narváez, sent by Spain to punish him for insubordination.
1521 – Ignatius of Loyola is seriously wounded in the Battle of Pampeluna.
1570 – Cartographer Abraham Ortelius issues Theatrum Orbis Terrarum, the first modern atlas.
1609 – Shakespeare's sonnets are first published in London, perhaps illicitly, by the publisher Thomas Thorpe.
1631 – The city of Magdeburg in Germany is seized by forces of the Holy Roman Empire and most of its inhabitants massacred, in one of the bloodiest incidents of the Thirty Years' War.
1645 – Yangzhou massacre: The ten day massacre of 800,000 residents of the city of Yangzhou, part of the Transition from Ming to Qing.
Official source
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