 Köten converted to Roman Catholicism, being baptised in 1239 as Jonas, while his daughter Elizabeth married Bela's son, the future Stephen V. The Hungarian nobles, however, distrusted the Cuman-Kipchaks (possibly believing they were Mongol spies) and just prior to the disastrous Mongol invasion which led to the rout of Mohi, they had Köten assassinated in Pest.The Cumans then left Hungary, pillaging along the way and emigrated to the Second Bulgarian Empire.Some of the Cumans were later called back to Hungary.