Mary, Queen of Scots, 'Queen Mary Beheaded 1587', Portrait Miniature.'Queen Mary Beheaded 1587' Portrait Miniature, on Card or Paper, in an Ebonised Mount with Foliate Roundels in a Moulded Gilt Frame and Convex Glazed. The only daughter of James V and Mary of Guise, of the ruling Stewart dynasty. Mary became Queen of Scots at only six days of age, reigning from 1542 until her forced abdication in 1567. After 19 years as a prisoner of her cousin, Elizabeth I of England, Mary was executed on 8 February 1587 at