Overview
Lady Agnes Campbell (1526–1601) was the daughter of The 3rd Earl of Argyll and his wife, Lady Jean Gordon, daughter of The 3rd Earl of Huntly. She was likely born at Inveraray Castle. Her sister, Elizabeth, married The 1st Earl of Moray, an illegitimate son of King James IV of Scotland.
Campbell married James MacDonald, the 6th Chief of Clan MacDonald of Dunnyveg and the Glens of Antrim in 1545, forming an alliance with the MacDonalds. Women in early modern Scotland did not use their husband's surnames after marriage. They had six sons and one daughter, Finola O'Donnell, more famously known as Iníon Dubh. She married Sir Hugh O'Donnell.
In June 1563 Agnes Campbell gave Mary, Queen of Scots a "marvellous fair" Highland costume to wear on a progress to Argyll.
Campbell's husband James died in 1565 while he was being held prisoner by the Irish chieftain Shane O'Neill. At that time O'Neill had been supporting the English.
From Wikipedia (CC BY-SA 4.0).