List of state leaders in 1403

1402 state leaders - Events of 1403 - 1404 state leaders - State leaders by year

Africa

• Empire of Ethiopia - Dawit I (1382–1413)

Asia

• China (Ming Dynasty) - Yongle Emperor (1402–1424)
• Kingdom of Chūzan - Bunei (1395–1407)
• Kingdom of Hokuzan - Hananchi (1401–1416)
• Japan (Muromachi period)
  • Monarch - Emperor Go-Komatsu (1392–1412)
  • Shogun (Ashikaga) - Ashikaga Yoshimochi (1394–1423)
• Korea (Joseon Dynasty) - Taejong (1400–1418)
• Kingdom of Nanzan - Ououso (1403–1413)

Europe

• Duchy of Athens - Antonio I Acciaioli (1402–1435)
• Duchy of the Archipelago - Giacomo I Crispo (1397–1418)
• Byzantine Empire - Manuel II Palaeologus (1391–1425)
• Kingdom of Castile - Henry III (1390–1406)
• Kingdom of England - Henry IV (1399–1413)
• Kingdom of France - Charles VI (1380–1422)
• Germany - (House of Wittelsbach) - Ruprecht, King of the Romans (1400–1410)
  • Bavaria-Straubing (House of Wittelsbach) - Albert, Duke of Bavaria-Straubing and Count of Holland and Hainaut (1347–1404)
  • Margraviate of Meißen (Wettin) - William the One-Eyed (1349–1407), Wilhelm the Rich (1381–1425) and Friedrich the Belligerent (1381–1428)
  • Landgraviate of Thuringia (Wettin) - Balthasar, Landgrave of Thuringia (1349–1406)
• The Morea - Theodore I Palaiologos, Despot of Morea (1383–1407)
• Kingdom of Poland - Władysław II Jagiełło (1386–1434)
• Kingdom of Portugal - John I (1385–1433)
• Kingdom of Scotland - Robert III (1390–1406)
• Principality of Theodoro - Alexios I (1402–1434)
• Principality of Tver - Ivan (1400–1425)

Middle East and North Africa

• Aq Qoyunlu (White Sheep Turkomans) -
  1. White Sheep Turkomans granted control of a part of Anatolia by Tamerlane in 1402
  2. Kara Osman (1403–1435)
• Kingdom of Cyprus - Janus (1398–1432)
• Mamluk Sultanate of Egypt - Faraj (1399–1405)
• Empire of Trebizond - Manuel III (1390–1416)