John of Islay Scottish Lord of the Isles (1336–1386) and chief of Clan Donald (1318–1386) Parents Agnes O'Cathan Aonghus Óg of Islay Children Elizabeth MacDonald Ranald MacDonald Angus MacDonald Alistair Carragh Macdonald Elizabeth Macdonald Mary MacDonald Marcus MacDonald Domhnall of Islay Agnes of the Isles Hugh MacDonald, Thane of Glen Tilt Godfrey Macdonald Iain Macdonald John Mór Tanister Siblings Iain Fraoch MacDonald Finvola Macdonald Mary Macdonald Partners Margaret Stewart Amy of Garmoran