William courtenay, 3rd viscount courtenay (1768-1835), in the masquerade dress he wore at his coming-of-age ball at powderham castle in 1789. Detail from portrait by richard cosway (1742-1821), collection of earl of devon, powderham castle, hanging over chimneypiece in music room. Object Type: painting. Date: 1789. Medium: painting. Collection: Powderham Castle.
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