.... of JONAS of the Kumans

In 1239 or 1240, presumably after his first wife's death, Narjot de Toucy married a daughter of Jonas (i.e. Kotian), King of the Cumans. She became a nun after his death.

en.wikipedia.org/wiki/Narjot_de_Toucy

Commentary -- Inasmuch as Khan Koten II was born circa 1214, a reasonably plausible extrapolated earliest birth year for this unnamed daughter would be circa 1229, when Khan Koten would be approximately fifteen years old. Based on this reasonably plausible extrapolated earliest birth year, this unnamed daughter of Khan Koten II would necessarily only be ten or eleven years old at the time of her marriage to Narjot de Toucy, then appr. sixty years old. If nothing else, this would suggest that Khan Koten II may not have actually been the father of this unnamed daughter.