List of state leaders in 1251

This is a list of heads of state, government leaders, and other rulers in the year 1251.

Asia

• China (Southern Song dynasty) - Emperor Lizong (1224–1264)
• Korea (Goryeo Kingdom) – Gojong (1213–1259)
• Japan (Kamakura period)
  • Monarch – Emperor Go-Fukakusa (1246–1260)
  • Kamakura shogunate - Kujō Yoritsugu (1244–1252)
  • Shikken - Hōjō Tokiyori (1246–1256)
• Khmer Empire – Jayavarman VIII (1243–1295)
• Mongol Empire –
  1. Oghul Qaimish, regent (1248–1251)
  2. Möngke Khan (1251–1260)
• Pagan Kingdom – Uzana (1250–1255)
• Sukhothai Kingdom – Sri Indraditya (1249–1257)

Europe

• Principality of Achaea – William II of Villehardouin (1246–1278)
• County of Angoulême – Hugh II (1249–1260)
• Kingdom of Aragon – James I (1213–1276)
• Kingdom of Bohemia - Wenceslaus I (1230–1253)
• Duchy of Brittany – John I (1237–1286)
• Bulgarian Empire – Michael II Asen, Tsar of Bulgaria (1246–1256)
• Crown of Castile – Ferdinand III (1217–1252)
• County of Champagne – Theobald IV (1201–1253)
• Kingdom of Denmark – Abel (1250–1252)
• Kingdom of England – Henry III (1216–1272)
• County of Flanders – Margaret II (1244–1278)
• Kingdom of France – Louis IX (1226–1270)
• Kingdom of Gwynedd – Llywelyn ap Gruffudd (1246–1282)
• Holy Roman Empire – Conrad IV, King of the Romans (1237–1254)
  • County of Holland – William II, rival King (1234–1256)
• Kingdom of Hungary – Béla IV (1235–1270)
• Kingdom of Lithuania – Mindaugas (1236–1253)
• Kingdom of Navarre – Theobald I (1235–1253)
• Kingdom of Norway – Haakon IV (1217–1263)
• Duchy of Poland – Bolesław V the Chaste, High Duke of Poland (1243–1279)
• Kingdom of Portugal and the Algarves – Afonso III (1249–1279)
• Kingdom of Scotland – Alexander III (1249–1286)
• Kingdom of Sweden
  • Monarch – Valdemar I (1250–1275)
  • Regent – Birger Jarl, regent of Sweden (1250–1266)

Middle East and North Africa

• Almohad Caliphate – Umar, Almohad Caliph (1248–1266)
• Principality of Antioch – Bohemond V (1233–1252)
• Armenian Kingdom of Cilicia – Hethum I (1226–1270)
• Kingdom of Cyprus – Henry I (1218–1253)
• Sultanate of Damascus – An-Nasir Yusuf (1250–1260)
• Mamluk Sultanate of Egypt (Ayyubid dynasty) - Al-Ashraf II (1250–1254)
• Sultanate of Rûm – Kaykaus II (1246–1262)
• Empire of Trebizond – Manuel I (1238–1263)