Died in 1450

Feb 9 Agnès Sorel a favourite mistress of King Charles VII of France, by whom she bore three daughters. She is considered the first officially recognized royal mistress. She was the subject of several contemporary paintings and works of art, including Jean Fouquet's Virgin and Child Surrounded by Angels
Mar 23 Helena Dragaš the empress consort of Byzantine emperor Manuel II Palaiologos. She is venerated as a saint by the Eastern Orthodox Church under the name of Saint Hypomone , translated in English as Saint Patience
Apr 8 Sejong the Great the fourth king of Joseon. Born with family name Yi , given name Do , family origin Jeonju , sobriquet Wonjeong. Posthumous name is Sejong. Posthumous title, abbreviated, is JangHun Great King , and official title is Sejong Jangheon Yeongmun Yemu Inseong Myeonghyo Daewang. He was the third son between King Taejong and Queen-Consort Min. He was designated as heir-apparent, Grand Prince, after his older brother Jae was stripped of his title. He ascended to the throne in 1418. During the first four years of his reign, Taejong governed as regent, and this was when his father-in-law, Shim Ohn, and his close associates were executed
May 2 William de la Pole 1st Duke of Suffolk an English commander in the Hundred Years' War and Lord High Admiral of England from 1447 until 1450. He was nicknamed Jack Napes, from which the word "jackanapes" derives. He also appears prominently in William Shakespeare's Henry VI, Part 1 and Henry VI, Part 2
May 9 Abdal-Latif Mirza the great-grandson of Central Asian emperor Timur. He was the third son of Ulugh Beg, Timurid ruler of Transoxiana
Jul 12 Jack Cade the leader of a popular revolt against the government of England in 1450. At the time of the revolt, the weak and unpopular King Henry VI was on the throne. While little is known about the rebel leader himself, the events of the rebellion to which he gave his name are well recorded in fifteenth-century chronicles. The Jack Cade Rebellion stemmed from local grievances concerned about the corruption and abuse of power surrounding the king's regime and his closest advisors. Furthermore the rebels were angered by the debt caused by years of warfare against France and the recent loss of Normandy. Leading an army of men from Kent and the surrounding counties, Jack Cade marched on London in order to force the government to end the corruption and remove the traitors surrounding the king's person. Despite Cade's attempt to keep his men under control once the rebel forces had entered London they began to loot. The citizens of London turned on the rebels and forced them out of the city in a bloody battle on London Bridge. To end the bloodshed the rebels were issued pardons by the king and told to return home. Cade fled but was later caught on 12 July 1450 by Alexander Iden, a future High Sheriff of Kent. As a result of the skirmish with Iden, Cade was mortally wounded before reaching London for trial. The Jack Cade Rebellion has been perceived as a reflection of the social, political and economic issues of the time period and as a precursor to the Wars of the Roses which saw the decline of the Lancaster dynasty and the rise of the Yorks. The Jack Cade Rebellion was the largest popular uprising to take place in England during the 15th century
Jul 17 Francis I Duke of Brittany Duke of Brittany, Count of Montfort and titular Earl of Richmond, from 1442 to his death. He was son of Duke John VI and Joan of France
Jul 30 Henry XVI Duke of Bavaria since 1393 Duke of Bavaria-Landshut. He was a son of duke Frederick and his wife Maddalena Visconti, a daughter of Bernabò Visconti
Aug 27 Reginald West 6th Baron De La Warr the second son of Thomas West, 1st Baron West and Joan La Warre , widow of Ralph de Wilington of Sandhurst, Gloucestershire, and daughter of Roger La Warr, 3rd Baron De La Warr , by his second wife, Eleanor Mowbray, daughter of John de Mowbray, 3rd Baron Mowbray. He had an elder brother, Thomas West, 2nd Baron West, a younger brother, John, and a sister Joan, who married firstly Richard Delabere and secondly William Catesby. He inherited the title of Baron West when his brother Thomas West, 2nd Baron West, was accidentally killed at sea on 29 or 30 September 1416, and the title Baron De La Warr in 1427 at the death of his uncle, Thomas la Warr, 5th Baron De La Warr
Oct 1 Leonello d'Este Marquis of Ferrara marquis of Ferrara and Duke of Modena and Reggio Emilia from 1441 to 1450.
Nov 5 John IV Count of Armagnac a Count of Armagnac, Fézensac, and Rodez from 1418 to 1450. He was the son of Bernard VII of Armagnac, Count d' Armagnac, of Fézensac, Pardiac, and Rodez; and the brother of Bernard of Armagnac, Count of Pardiac, of La Marche and Duke of Nemours. His mother was Bonne of Berry, niece of Charles V of France