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John Mercer emigrated from Ireland in 1720. His first wife was Catherine Mason. His second wife was Anne Roy. Mercer lived at Marlborough Point. The subject was also painted by William Dering.
Dimensions: 27 x 22 1/2 in. (68.58 x 56.73 cm.)
The subject wears a jacket over a dark waistcoat and a gray wig. He is turned three-quarters to his left. His right hand rests on top of a book.