Ögedei Khan's favorite son was Kochu, who was his through another wife, and he had nominated Kochu's son Siremun to succeed him after his father suddenly died in China in 1237.
Ögedeis favoritson hade varit Kochu, som var han fått genom en annan hustru, och han hade utnämnt Kochus son Siremun att efterträda honom efter Kochus plötsliga död i Kina 1237.