The subject of this portrait, John Rous, was a staunch and courageous supporter of Charles II in exile and in 1660 was awarded a hereditary baronetcy by the restored king. It was presumably to mark this event that Rous arranged to be painted by Peter Lely, then known as the best painter in London. In the 1640s, after the death in England of the great painter Sir Anthony van Dyck, Lely had travelled from The Hague to London, arriving during the Civil War. The painting was made at the height of Lely’s talents, just prior to his appointment as principal painter to Charles II, before the period when he began relying on teams of studio assistants.