The arms are those of Stuart impaling those of Bertie for Charles Stuart, 1st Baron Stuart de Rothesay (1779-1845). Charles Stuart entered the diplomatic service at the age of 22, and served his long career with great distinction in Spain, Austria, Russia, Portugal, the Netherlands, France and Brazil. He was considered the Duke of Wellington's "right-hand man in the Peninsular War, as Commissioner managing the Spaniards and Portuguese Juntas." In 1816, he married Elizabeth Margaret, daughter of the 3rd Earl of Hardwicke, and was created Baron Stuart de Rothesay in 1828, an honor usually reserved for the Prince of Wales. He died in 1845 at his residence, Highcliffe, at which time the barony became extinct.