List of state leaders in 1234
1233 state leaders - Events of 1234 - 1235 state leaders - State leaders by year
Africa
- Egypt - Al-Kamil, Ayyubid Sultan of Egypt (1218-1238)
- Kingdom of Ghana (Susu Kingdom) - Sumanguru Kante, King of Ghana (~1200-1235)
- Kano - Naguji, Emir of Kano (c.1194-c.1247)
- Kanem-Bornu - Kade, Mai of Kanem (1224-1242)
Asia
- Aleppo - Al-Aziz, Ayyubid Emir of Aleppo (1216-1236)
- Armenia - Isabella, Queen of Armenia (1219-1252)
- Beirut - John of Ibelin, Lord of Beirut (c. 1200-1236)
- Byzantine Empire - in exile in the Empire of Nicaea - John III Ducas Vatatzes, Byzantine Emperor (1222-1254)
- China (Jin Dynasty) -
- Aizong, Emperor of Jin China (1224-1234)
- Modi, Emperor of Jin China (1234)
- succumbed to Mongol Empire
- China (Southern Song Dynasty) - Lizong, Emperor of Song China (1224-1264)
- Cyprus - Henry I, King of Cyprus (1218-1253)
- Goryeo - Gojong, King of Goryeo (1213-1259)
- Homs - Al-Mujahid, Ayyubid Emir of Homs (1186-1240)
- India - Iltutmish, Mameluk sultan of India (1211-1236)
- Japan
- Monarch - Shijo, Emperor of Japan (1232-1242)
- Shogun (Kamakura) - Kujo Yoritsune, Shogun of Japan (1226-1244)
- Shikken - Hojo Yasutoki, Shikken (1224-1242)
- The Jezirah - Al-Ashraf, Ayyubid ruler of the Jezirah (1218-1237)
- Khmer Empire - Indravarman III? (1220-1243)
- Mongol Empire - Ögedei Khan, Mongol Khan (1229-1241)
- Trabzon - Andronicus I, Emperor of Trebizond (1222-1235)
Europe
- Angouleme - Hugh I, Count of Angouleme (1218-1249)
- Aquitaine - Henry II, Duke of Aquitaine (1216-1254)
- Aragon - James I King of Aragon and count of Barcelona (1213-1276)
- Auvergne - Robert IV, Dauphin of Auvergne (1169-1235)
- Bar - Henry II, Count of Bar (1214-1239)
- Boulogne - Matilda II, Countess of Boulogne (1216- c. 1260)
- Brabant - Henry I, Duke of Brabant (1190-1235)
- Britanny - Peter I, Duke of Brittany (1213-1237)
- Bulgaria - Ivan Asen II, King of Bulgaria (1218-1241)
- Burgundy - Hugh IV, Duke of Burgundy (1218-1272)
- Carinthia - Bernard, Duke of Carinthia (1201-1256)
- Castile - Ferdinand III, the Saint King of Castile and Leon (1217-1252)
- Champagne - Theobald IV, Count of Champagne (1201-1253)
- Denmark - Valdemar II, the Victorious King of Denmark (1202-1241)
- Dymin - Warcislaw III, Duke of Dymin (1219-1264)
- England - Henry III, King of England (1216-1272)
- Flanders - Jeanne, Countess of Flanders (1205-1244)
- Gdansk - Swietopelk II the Great, Duke of Gdansk (1215-1266)
- Gwynedd - Llywelyn the Great, Prince of Gwynedd (1194-1240)
- Hainaut - Jeanne, Countess of Hainaut (1205-1244)
- Holy Roman Empire - Frederick II Holy Roman Emperor (1211-1250) and King of Sicily (1198-1250)
- Hungary - Andrew II, King of Hungary (1205-1235)
- Ireland - Henry III of England, Lord of Ireland (1216-1272)
- Lorraine - Matthias II, Duke of Lorraine (1220–1251)
- Navarre - Sancho VII the Strong, King of Navarre (1194-1234)
- Normandy - Henry III, Duke of Normandy (claimed, 1216-1259)
- Norway - Haakon IV, King of Norway (1217-1263)
- Poitiers - Alphonse of Toulouse, Count of Poitiers (1220-1271)
- Powys - Madog ap Gruffydd Maelor, Prince of Powys (1191-1236)
- Provence - Ramon Berenguer IV, Count of Provence (1209-1245)
- Rugia - Wislaw, Duke of Rugia (1218-1249)
- Russia - Yuri II, Tsar of Russia (1218-1238)
- Saxony - Albert II, Duke of Saxony (1212-1260)
- Scotland - Alexander II, King of Scotland (1214-1249)
- Swabia - Henry II, Duke of Swabia (1216-1235)
- Sweden -
- Szczecin - Dobry, Duke of Szeczcin (1220-1278)
- Wroclaw - Henry I the Bearded, Duke of Wroclaw (1201-1238)
- Württemberg - Hartmann, Count of Württemberg (1194-1240)