late 14th century) was a Scottish noblewoman, a mistress and intended-wife of King David II of Scotland, son of Robert the Bruce.
[4] She was also the "very dear sister" of George Dunbar, 10th Earl of March who granted to her the lands of Mordington and Whittinghame, on her marriage with Sir James Douglas of Dalkeith.
King David attempted to divorce Margaret on the grounds of infertility, but this was refused by Pope Urban V. He was still planning to marry Agnes when in February 1371 he suddenly died.
[1] A payment of 1000 merks, a very large sum at that time, was arranged for her a month before the king's death.
They also had a daughter, Jacoba Douglas who married John Hamilton, 4th Laird of Cadzow (born before 1370 – died c.