In one of the publications issued back when the current Prince Charles was wed to Diana Spencer; there was a chart showing they were distantly related through James I (VI). It showed that King Charles II (1630-1685) had a bastard son by Barbara Villiers, Duchess of Cleveland (1641-1709); named Henry (Fiztroy) (1663-1690) who was created 1st Duke of Grafton . Henry married Lady Isabella Bennett and had Chalres (Fitzroy) (1683-1757) who was 2nd Duke of Grafton. He married Lady Henrietta Somerset and had Isabella (1726-1782) who married Francis Seymour 1st Marquess of Hertford.