James Scott, 1st Duke of Monmouth, 1st Duke of Buccleuch, KG, PC (9 April 1649 – 15 July 1685) was a Dutch-born English nobleman and military officer. Originally called James Crofts or James Fitzroy, he was born in Rotterdam in the Netherlands, the eldest illegitimate son of Charles II of England, Scotland, and Ireland with his mistress Lucy Walter.