1403 deaths

fourth Sultan of the Ottoman Empire (1389–1402)

Ottoman prince (1380-1407), son of Bayezid I

Third wife of John of Gaunt, Duke of Lancaster

English noble

timurid military commander

Nobleman, Lord of Zeta

Muslim scholar (1325-1404)

Polish Duke

Earl of Worcester

Count of Holstein-Rendsburg and Holstein-Segeberg

Czech poet and politic writer

French cardinal

English noble (1377-1403)

cardinal

Beg of Aq Qoyunlu from 1389 to 1403

Russian noble

15th century scholar of Islamic Jurisprudence

Mongol spiritual teacher

Mutahharten (), also known as Taharten (; died late 1403), was Emir of Erzincan from 1379 until his death. Erzincan was previously ruled by emirs who exercised autonomy as vassals of the Eretnids. Mutahharten claimed sovereignty from the Eretnids when he assumed power, which prompted the Eretnid Sultan Ala al-Din Ali () to go on an expedition to reinstate his authority over Erzincan. While Mutahharten ultimately repelled Ali, the latter was replaced by his vizier Kadi Burhan al-Din (), who was determined to restore the sultanate's former boundaries. Burhan al-Din and Mutahharten were involved

thumb|right|Manuscript of Ali ibn al-Hasan Zayn al-Din 'Attar Ansari Shirazi's ''Ikhtiyarat Badi'i. Copy created in Timurid Empire|Timurid Iran, dated 29 July 1444 Haji Zayn Attar ( 1329–1403) was a 14th-century Persian physician. He is best known as the author of the Persian language pharmacopoeia Ekhtiyarat i Badi i''.

Ming and Yuan dynasty Chinese scholar (1316/22/29 to 1403/10), author of the Nancun Chuogenglu

ruler of the Afrasiyab dynasty

French historian (1333-1403)

Was the Mihrabanid malik of Sistan

Scottish noble

German architect