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English noblewoman
Arabella Stewart, Countess of Galloway (26 April 1850 – 18 August 1903), formerly Lady Mary Arabella Arthur Cecil, was the wife of Alan Stewart, 10th Earl of Galloway.
She married the future earl on 25 January 1872, a year before he succeeded to his father's titles. As Lord Garlies, he was Conservative MP for Wigtownshire, thus representing the same party as his brother-in-law.
There were no children from their marriage. The earl died in 1901, aged 65, and was succeeded in the earldom by his brother Randolph Henry Stewart, 11th Earl of Galloway. A portrait photograph of the countess, taken during the 1870s by John Watkins, is held by London's National Gallery.