List of state leaders in 1420
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1419 state leaders - Events of 1420 - 1421 state leaders - State leaders by year

Africa

• Ethiopia - Yeshaq I, Emperor of Ethiopia, (1414-1429)

Asia

• China (Ming Dynasty) - Yongle, Emperor of China (1402 - 1424)
• Chūzan - Shō Shishō - King of Chūzan (1407-1421)
• Japan
  • Monarch - Shoko, Emperor of Japan (1412-1428)
  • Shogun (Ashikaga) - Ashikaga Yoshimochi, Shogun of Japan (1394-1423)
• Korea (Joseon Dynasty) - Sejong, King of Joseon (1418-1450)
• Nanzan - Taromai - King of Nanzan (1415-1429)

Europe

• Byzantine Empire - Manuel II Palaeologus, Byzantine Emperor, (1391-1425)
• Castile - John II, King of Castile (1406-1454)
• England - Henry V, King of England (1413-1422)
• France - Valois Dynasty - Charles VI of France the Well-Beloved, later the Mad (1380-1422)
• Germany (House of Luxembourg) - Sigismund, King of the Romans (1410-1437)
  • Bavaria-Straubing (civil war) (house of Wittelsbach) -
    • Jacqueline, duchess of Bavaria-Straubing and countess of Holland and Hainaut (1417-1432)
    • John, duke of Bavaria-Straubing and count of Holland and Hainaut (1417-1425)
  • Margraviate of Meißen (Wettin) - Wilhelm der Reiche (1381-1425) and Friedrich der Streitbare (1381-1428)
  • Thuringia (Wettin) - Friedrich IV der Friedfertige (1406-1440)
• Naples - rival claimants:
  • Joan II, Queen of Naples (1414-1435)
  • Louis III, King of Naples (1417-1426)
• Poland - Władysław II Jagiełło, King of Poland (1386-1434)
• Scotland - James I, King of Scotland (1406-1437)
• Bosnia
  • Tvrtko II, restored, King of Bosnia (1421-1433)

Middle East and North Africa

• Ak Koyunlu - Kara Osman, Leader of the White Sheep Turkmen (1403-1435)
• Cyprus - Janus, King of Cyprus (1398-1432)
• Egypt - Sayf-ad-Din Tatar, Sultan of Egypt (1412-1421)
• Trebizond - Alexius IV, Emperor of Trebizond (1416-1429)