1340 in history

1340 events chronologically

Jan 26 King Edward III of England is declared King of France
Apr 1 Niels Ebbesen kills Gerhard III of Holstein in his bedroom, ending the 1332-1340 interregnum in Denmark
Jun 24 Hundred Years' War: Battle of Sluys – The French fleet is almost completely destroyed by the English Fleet commanded in person by King Edward III
Oct 30 Portuguese and Castilian forces halt a Marinid invasion at the Battle of Río Salado

Born in 1340

Jan 23 Biligtü Khan Ayushiridara a ruler of the Northern Yuan Dynasty in Mongolia. Ascended to the throne after the death of his father who was the last Yuan emperor, he defeated the invading Ming army in 1372 and recaptured some Chinese borderlands that were previously lost to the newly founded Ming Dynasty
Mar 6 John of Gaunt 1st Duke of Lancaster a member of the House of Plantagenet, the third surviving son of King Edward III of England and Philippa of Hainault. He was called "John of Gaunt" because he was born in Ghent, then rendered in English as Gaunt. When he became unpopular later in life, scurrilous rumours and lampoons circulated that he was actually the son of a Ghent butcher, perhaps because Edward III was not present at the birth. This story always drove him to fury
Nov 30 John Duke of Berry Duke of Berry and Auvergne and Count of Poitiers and Montpensier. He was the third son of King John II of France and Bonne of Luxemburg; his brothers were King Charles V of France, Duke Louis I of Anjou and Duke Philip the Bold of Burgundy. He is primarily remembered as a collector of the important illuminated manuscripts and other works of art commissioned by him, such as the Très Riches Heures

Died in 1340

Mar 31 Ivan I of Moscow Prince of Moscow from 1325 and Grand Prince of Vladimir from 1328.
Apr 7 Bolesław Jerzy II of Mazovia a ruler of the Polish Piast dynasty who reigned in the originally Ruthenian principality of Galicia. After his death started the Galicia–Volhynia Wars over succession of Galicia and Volhynia
Aug 6 Basil of Trebizond Emperor of Trebizond from August 1332 until his death in 1340. Basil was a younger son of Emperor Alexios II of Trebizond and his wife Djiadjak Jaqeli. When his elder brother Andronikos III assumed the throne in 1330 and killed two of his brothers , Basil managed to escape to Constantinople
Dec 4 Henry Burghersh a younger son of Robert de Burghersh, 1st Baron Burghersh , and a nephew of Bartholomew, Lord Badlesmere, and was educated in France.
Dec 20 John I Duke of Bavaria the Duke of Lower Bavaria since 1339.