Agnes Keith, Countess of Moray

Lady Agnes Keith
Countess of Mar Countess of Moray Countess of Argyll
Agnes Keith by Hans Eworth, 1562; this is a detail from her wedding portrait
Spouse(s)	James Stewart, 1st Earl of Moray (m. 1562–70) Colin Campbell, 6th Earl of Argyll (m. 1572–84)
Issue Elizabeth Stewart, 2nd Countess of Moray Annabel Stewart Lady Margaret Stewart Hon. Colin Campbell of Lundie Lady Jane Campbell Archibald Campbell, 7th Earl of Argyll
Noble family	Keith
Father	William Keith, 4th Earl Marischal
Mother	Margaret Keith
Born	c.1540 Dunnottar Castle, Aberdeenshire, Scotland
Died	16 July 1588 Edinburgh, Scotland
Buried	St. Giles Cathedral, Edinburgh, Scotland
Religion	Church of Scotland

Agnes Keith, Countess of Moray (c. 1540 – 16 July 1588) was a Scottish noblewoman having been the eldest daughter of William Keith, 4th Earl Marischal and Margaret Keith. She was the wife of James Stewart, 1st Earl of Moray, Regent of Scotland and the illegitimate half-brother of Mary, Queen of Scots, making her a sister-in-law of the Scottish queen. As the wife of the regent, Agnes was the most powerful woman in Scotland from 1567 until her husband's assassination in 1570.

She was married secondly to Sir Colin Campbell, heir presumptive to the earldom of Argyll. When he succeeded his brother as the 6th earl in 1573, Agnes was henceforth styled Countess of Argyll. During her second marriage, Agnes became embroiled in a litigation over Queen Mary's jewels which had earlier fallen into her keeping. It was her refusal to hand the jewels over to the Scottish Government that sparked a feud between the Earl of Argyll and the Regent Morton.

Lady Agnes Keith was born in Dunnottar Castle, Aberdeenshire, Scotland in about 1540, the eldest daughter of William Keith, 4th Earl Marischal and Margaret Keith. Her paternal grandparents were Robert Keith, Master of Marischal, and Lady Elizabeth Douglas, and her maternal grandparents were Sir Wiliam Keith and Janet Gray. Agnes was a descendant of King James I of Scotland and his consort Joan Beaufort, who was in her turn the great-granddaughter of King Edward III of England.

She had two brothers, William Keith, Master of Marischal (died 1580), and Hon. Robert Keith, 1st Lord Altrie (died 1596); and six younger sisters. These were Elizabeth, wife of Sir Alexander Irvine of Drum; Alison, wife of Alexander, Lord Salton; Mary, wife of Sir John Campbell of Calder; Beatrice, wife of John Allardice of Allardice; Janet, wife of James Crichton of Frendraght; and Margaret, wife of Sir John Kennedy of Balquhan. Her aunt was Elizabeth Keith, wife of George Gordon, 4th Earl of Huntly who would lead an unsuccessful rebellion against Mary, Queen of Scots in 1562. Her first cousin was Lady Jean Gordon, the first wife of James Hepburn, Earl of Bothwell, who himself would become the third husband of Mary, Queen of Scots. Agnes's father was a member of Queen Mary's Privy Council; he had fought at the Battle of Pinkie when she was about seven years old. He died in 1581.