Isabella of Lennox

Isabella of Lennox (d.1458) was the ruler of Lennox, from 1437–1458, and last in the line of Mormaers or Native Scottish rulers. As the wife of Murdoch Stewart, 2nd Duke of Albany (d.1425), she was also Duchess of Albany (1420–1425), but in 1425 her family would be almost completely destroyed when her husband, father and two sons were executed by the vengeful King James I of Scotland. Only one son, James the Fat, would escape the King's wrath, and he would die in exile in Ireland soon after. Isabella succeeded in escaping the fate of her family, and would eventually regain her title and estates, retiring to her castle in Loch Lomond where she raised her grandchildren, the children of her youngest son. She would eventually live to see the violent death of her former persecutor, King James. Though none of her four sons survived her, her grandson Andrew Stewart, 1st Lord Avandale would in time rise to become Lord Chancellor of Scotland.

Isabella was the daughter of Donnchadh, Earl of Lennox and Helena, the daughter of Sir Archibald Campbell. Her father Duncan sought to create powerful links with the great Robert Stewart, 1st Duke of Albany, who was the second son of King Robert II by his first wife Elizabeth Mure of Rowallan, and who was to a certain extent the de facto ruler of Scotland, at points during the reigns of his father and elder brother. In 1392, Duncan agreed to marry Isabella to Robert's son, Murdoch Stewart.

Murdoch and Isabella did marry, and had at least five children:

Disaster struck Isabella's family when her husband, father and sons Walter and Alasdair were tried for treason and executed by the vengeful King James I of Scotland in 1425. Isabella and her daughter survived this violent purge of the Albany Stewarts, which almost obliterated her family, but she was forced to spend eight years as a royal hostage at Tantallon Castle. Just one son, James the Fat, escaped the King's vengeance in 1425, escaping to Antrim, Ireland, where he would spend the rest of his short life in exile. James died in 1429, prior to an abortive attempt to recapture the throne of Scotland,.

...
Wikipedia