Queen Elizabeth could see their marriage as a threat, as both were descended from Henry VIII's sister Margaret and thus could assert a claim to Elizabeth's crown.
Mary Stuart and Lord Darnley
Mary, Queen of Scots, with Her Cousin and Husband Henry Stewart
By Jone Johnson Lewis, About.com Guide
Mary married her cousin, Lord Darnley, against the wishes of Scottish nobles.
Mary, Queen of Scots, and her second husband, Henry Stewart, Lord Darnley
Getty Images / Hulton ArchiveMary, Queen of Scots
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