Frederick, Hereditary Prince of Württemberg, later Duke of Württemberg, and Frederick I, King of Württemberg (1805), was the eldest son of Duke Frederick Eugene of Württemberg and Frederica, daughter of Frederick, Margrave of Brandenburg-Schwedt. He married, firstly, in 1780, Augusta, eldest daughter of Charles II, Duke of Brunswick, by whom he had four children, and secondly, in 1797, Charlotte, Princess Royal, eldest daughter of George III and Queen Charlotte. He is depicted wearing general's uniform with the ribbon and star of the Saxe-Weimar Order of the White Falcon.

A miniature by William Essex, commissioned by Queen Victoria in 1846 after this portrait, is in the Royal Collection (RCIN 421872).