Some accounts describe her as Countess of Moray, on the assumption that she inherited the earldom when her brother John was killed at the Battle of Neville's Cross in 1346. However, the earldom actually reverted to the crown. But in 1371/2, Agnes’ nephew, John Dunbar, was created Earl of Moray by Robert II, his father-in-law.
Keith, Agnes: w. of Sir Archibald Douglas of Glenbervie ... Countess of Moray, w. of Sir James Stewart, 2nd Lord Doune, 2nd Earl of Moray in right of wife, ...
His illegitimate son by Margaret Stewart, 4th Countess of Angus was George Douglas, 1st Earl of Angus, who was the progenitor of the Earls of Angus also known as the "Red Douglases".   The prestige of the family was greatly increased when James Douglas's great nephew, James Douglas, 2nd Earl of Douglas married Isabel, a daughter of King Robert II of Scotland .
Agnes Keith (c. 1540 – 16 July 1588), On 8 February 1561/2 at Holyrood, Moray married Agnes Keith, daughter of William Keith, 4th Earl Marischal. The marriage produced three daughters:  Elizabeth Stuart, 2nd Countess of Moray (August 1565  – 18 November 1591), married James Stewart, 2nd Earl of Moray , on 23 January 1580/1581
Agnes Campbell, Lady Roseburn (1637–1716), printer, described as "Scotland's wealthiest early modern printer". Andrew Carnegie (1835–1919), steel magnate, major philanthropist; Thomas Catto, 1st Baron Catto (1879–1959), businessman, Governor of the Bank of England. William Chambers of Glenormiston (1800–1883), publisher
HMT Lord Keith: September 1939: Auxiliary patrol, returned December 1945 HMT Lord Lloyd: August 1939: Anti-submarine, sold 1945 HMT Lord Melchett: August 1939: Minesweeper, returned April 1946 HMT Lord Middleton (FY219) August 1939: Anti-submarine, returned 1945 HMT Lord Northcliffe: November 1939: Balloon barrage vessel, returned November 1945
Other historical figures commemorated by plaques of this period include Agnes Keith, Countess of Moray (1893); Robert Leighton (1883); Gavin Douglas (1883); Alexander Henderson (1883); William Carstares (1884); and John Craig (1883), and James Dalrymple, 1st Viscount Stair (1906).