He had accompanied his brother King Charles II to England in May and had participated in the King 's triumphal progress through London .
Also in September , Henrietta 's third son , Henry Stuart , Duke of Gloucester , died of smallpox in London aged 20 .
son had accompanied son 's brother King Charles II to England in May and had participated in the King 's triumphal progress through London .
Also in September , Henrietta 's third son , Henry Stuart , Duke of Gloucester , died of smallpox in London aged 20 .