John "Mór" Tanister MacDonald, of Dunnyveg

This family, than which there was none more powerful or distinguished among the cadets of the Isles, derives its descent from John Mor Tanister, second son of John, Lord of the Isles, by his second wife, Princess Margaret Stewart, daughter of King Robert II.
John Mor married Margery Bisset, daughter of Sir Hugh Bisset, and heiress in her own right of the Seven Glens of Antrim. Besides their possessions in Isla and Kintyre, the family of Dunnyveg had thus extensive Irish territories, and played an important part in the stirring drama of Irish warfare.
By his wife, Margery Bisset, John Mor had:
1. Donald Balloch, his successor.
2. Ranald Bane, from whom the family of Largie.

John Mor was assassinated in 1427.

Source: "The Clan Donald" Vol 3, page 374.