King of Gwynedd, jointly with his brother. The Annales Cambriæ record that "Iago et Idwal filii Idwal" laid waste to "Dewet" in 952. The Chronicle of the Princes of Wales records that "Iago and Ieuav, sons of Idwal, ravaged Dyfed twice" in 950. The Gwentian Chronicle records that "King Edgar…went to Gwynedd and causing Iago son of Idwal to come to him, he imposed upon him a tribute of three hundred wolves´ heads yearly" in 962. The Chronicle of the Princes of Wales records that "Iago son of Idwal blinded his brother Ieuav son of Idwal, and Ieuav was imprisoned, and after that hanged" in 967.
He was deposed in 972: the Chronicle of the Princes of Wales records that "Iago was expelled from his territory, and Howel ruled in consequence of his victory" in 972. The Chronicle of the Princes of Wales records that "Iago was captured, and Howel son of Ieuav had the victory and conquered the territory of Iago" in 978. 1
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