The world in 1243 AD — what happened that year

10 events the sources record for this year, grouped by region.

What happened

The Rum Seljuk sultan was defeated at Köse Dağ by the Mongol army led by Baiju Noyan, and ruled jointly with his brother Rukn al-Din. (Rashid al-Din, Jami' al-tawarikh (Compendium of Chronicles) 87460_djvu.txt 줄 28357–28359)

Siege (heading 'Siege of'): details unclear as the text is short. (Chronica Majora of Matthew Paris 줄 3536)
The Earl of Arundel (Harundelle) died on 7 May (nonis Maii). (Chronica Majora of Matthew Paris 줄 3943)
Herbert de Burgh, Earl of Kent, died full of years (plenus dierum). (Chronica Majora of Matthew Paris 줄 3954)
Henry III turned back a ship that had almost reached England; he was urgently recalled by a dispute in Gascony (Wasconienses). (Chronica Majora of Matthew Paris Luard IV p.245 · 줄 104–109)
The Canterbury convent and the Bishop of Lincoln quarreled bitterly over the removal of the abbot of Bardney. (Chronica Majora of Matthew Paris Luard IV p.245 · 줄 114–116)
Cardinal Sinibaldo was elected pope and took the name Innocent IV (around the feast of St John the Baptist's birth). (Chronica Majora of Matthew Paris Luard IV p.256 · 줄 762–767)
The emperor lost Viterbo (Biterbium) and nearby places; Romans and Viterbans divided the castle's garrison between them. (Chronica Majora of Matthew Paris Luard IV p.267 · 줄 1526–1552)
Many soldiers on the emperor's side were killed, and a knight of his side died from a crossbow bolt. (Chronica Majora of Matthew Paris Luard IV p.267 · 줄 1561–1564)
Envoys and an interpreter of the Tartar king visited the King of Hungary twice. (Chronica Majora of Matthew Paris Luard IV · 줄 2037–2039)