Died in 1429

Feb 20 Giovanni di Bicci de' Medici an Italian banker, a member of Medici family of Florence, and the founder of the Medici Bank. While other family members, such as Chiarissimo di Giambuono de' Medici, who served in the Signoria in 1201, and Salvestro de' Medici, who was implicated in the Ciompi Revolt of 1378, are historically significant, Giovanni's founding of the family bank truly began the family's rise to power in Florence. He was the father of Cosimo de' Medici , great-grandfather of Lorenzo de Medici and great-great-great-grandfather of Cosimo I de' Medici, Grand Duke of Tuscany
Mar 10 John III Marquis of Namur between 1418 and 1429 the last independent Marquis of Namur.
Jun 22 Jamshīd al-Kāshī a Persian astronomer and mathematician.
Jul 2 Philipp I Count of Nassau-Weilburg Count of Nassau in Weilburg, Count of Saarbrücken and Seigneur of Commercy Château bas in 1371–1429.
Jul 12 Jean Gerson a French scholar, educator, reformer, and poet, Chancellor of the University of Paris, a guiding light of the conciliar movement and one of the most prominent theologians at the Council of Constance, was born at the village of Gerson, in the bishopric of Reims in Champagne.
Jul 23 Margaret of Prades the queen consort of Aragon as a wife of the King Martin of Aragon.
Aug 15 Çandarlı Ibrahim Pasha the Elder an Ottoman statesman who served as Grand Vizier of the Ottoman Empire under Murad II from 1421 to 1429.
Sep 28 Cymburgis of Masovia in January 1412 became the second wife of the Habsburg Duke Ernest the Iron of Austria and thus a Duchess/Archduchess of the Inner Austrian line in Styria, Carinthia and Carniola.