John Stewart, 1st Earl of Atholl (c. 1440 – 19 September 1512), also known as Sir John Stewart of Balveny, was a Scottish nobleman and ambassador to England (in 1484). ref Duke of Atholl He was the oldest child of Joan Beaufort, widowed Queen of James I of Scotland, and her second husband Sir James Stewart, the Black Knight of Lorn.
https://www.geni.com/people/Sir-John-Stewart-1st-Earl-of-Atholl/6000000005380754889

