sentences:  Certainly, Eóin Mac Domhnaill—Aonghus Óg's lawful son by Áine Ní Chatháin—held the chiefship by the 1330s, and became the first member of Clann Domhnaill to rule as Lord of the Isles.Aonghus Óg was a younger son of Aonghus Mór mac Domhnaill, Lord of Islay, chief of Clann Domhnaill.The latter last appears on record in 1293, when he was listed as one of the principal landholders in Argyll.