Who married Robert Douglas, 8th Earl of Morton?

Robert Douglas, Earl of Morton (died 12 November 1649) was a Scottish nobleman and Earl of Morton. He was the son of William Douglas, 7th Earl of Morton and Lady Anne Keith, daughter of George Keith, 5th Earl Marischal.

Anne Douglas, Countess of Morton (c. 1610 – 15 December 1654), born Anne Villiers, was an English noblewoman, famed for her beauty, bravery and loyalty to the throne. The first half of the 17th-century closet drama Cicilia and Clorinda was dedicated to her.