1256 state leaders - Events of 1257 - 1258 state leaders - State leaders by year

Asia

• China (Southern Song Dynasty) - Lizong , Emperor of China (1224 - 1264)
• Goryeo (Korea) - King Gojong , King of Goryeo (1213 - 1259)
• Japan
  • Monarch - Go-Fukakusa, Emperor of Japan (1246-1260)
  • Shogun (Kamakura) - Prince Munetaka, Shogun of Japan (1252-1266)
  • Shikken - Hojo Nagatoki , Shikken (1256-1264)
• Khmer Empire - Jayavarman VIII (1243 - 1295)
• Mongol Empire - Möngke Khan, Mongol Khan (1251 - 1260)
• Pagan - Narathihapate , King of Pagan (1254 - 1287)
• Sukhotai -
  1. Pho Khun Si Indrathit , King of Sukhothai (1249 - 1257)
  2. Pho Khun Ban Muang , King of Sukhothai (1257 - 1277)

Europe

• Achaea - William II Villehardouin, Principality of Achaea (1246 - 1278)
• Angouleme - Hugh II , Count of Angouleme (1249 - 1260)
• Bohemia - Ottokar I, King of Bohemia (1253 - 1278)
• Brittany - John I, Duke of Brittany (1237 - 1286)
• Bulgaria -
  1. Michael II Asen , King of Bulgaria (1246 - 1256/1257)
  2. Kaliman II , King of Bulgaria (1256/1257)
  3. Mico, King of Bulgaria (1256/1257)
  4. Constantine Tikh , King of Bulgaria (1257 - 1277)
• Castile - Alfonso X of Castile, King of Castile and Leon (1252 - 1284)
• Champagne - Theobald V, Count of Champagne (1253 - 1270)
• Denmark - Christopher I, King of Denmark (1252 - 1259)
• England - Henry III, King of England (1216 - 1272)
• Flanders - Margaret II, Countess of Flanders (1244 - 1278)
• France - Louis IX, King of France (1226 - 1270)
• Gwynedd - Llywelyn the Last, Prince of Gwynedd (1246 - 1282)
• Holland - Floris V, Count of Holland (1256 - 1296)
• Hungary - Béla IV, King of Hungary (1235 - 1270)
• Navarre - Theobald II of Navarre, King of Navarre (1253 - 1270)
• Norway - Håkon IV, King of Norway (1217 - 1263)
• Poland - Boleslaus V, High Duke of Poland (1243 - 1279)
• Portugal - Alfonso III, King of Portugal (1249 - 1279)
• Scotland - Alexander III, King of Scotland (1249 - 1286)
• Sweden
  • Monarch - Valdemar I, King of Sweden (1250-1275)
  • Regent - Birger Jarl, regent of Sweden (1250-1266)

Middle East and North Africa

• Antioch - Bohemund VI, Prince of Antioch (1252 - 1268)
• Armenia - Hethum I of Armenia, King of Armenia (1226 - 1270)
• Cyprus - Hugh II, King of Cyprus (1253-1268)
• Egypt -
  1. Aybak , Sultan of Egypt (1254-1257)
  2. Nur ad-Din Ali , Sultan of Egypt (1257-1259)
• Ilkhanate - Hülëgü, Ilkhan (1256-1265)