 Itoku is believed to be the son of Emperor Annei, and his mother is believed to have been Nunasoko-Nakatsu-hime.The latter of the two is allegedly the granddaughter of Kotoshiro-Nushi-no-kami.The "Kojiki" records that Itoku was the second or third son of Emperor Annei, but the surviving documents provide no basis for speculating why the elder brother or brothers were passed over for the throne.