born: 1523
died: 1586
Margaret was reputed to be a witch, and was said to have cast the pains of childbirth from the Queen of James VI upon Margaret, daughter of John Beaton of Creich.  She may have been a member of the Dianist cult considered by James VI to be one of the most dangerous menaces to his personal safety and his crown. 
Margaret's grandmother, Agnes Stuart, was the great-grandmother of Francis Stewart, 5th Earl of Hepburn, the Arch-Dianist of Scotland.    Margaret Beaton, who suffered the Queen's childbirth pains by proxy, had a sister Janet who was also alledged to be a witch, and was said to have influenced Queen Mary into her disastrous marriage to James Hepburn, 4th Earl of Bothwell. 
Margaret's son by her third marriage, John Stewart, Earl of Atholl, was one of the conspirators who in 1593 helped smuggle the Earl of Bothwell into the king's bedroom.    In 1591 a number of Dianists were charged with attempting to murder the King by witchcraft in order "that another might have ruled in His Majesty's place, and the government might have gone to the Devil".  Bothwell escaped, but his co-conspirators were burnt at the stake.

Father: Sir Malcolm Fleming, 3rd Lord Fleming
Mother:  Lady Janet Stuart

Spouse: Robert Graham, Earl of Montrose

Children:
1. John Graham, Earl of Montrose

Spouse: Thomas Erskine
Spouse: John Stewart, Earl of Atholl