sentences:  His two older brothers Toby Caulfeild, 3rd Baron Caulfeild and Robert Caulfeild, 4th Baron Caulfeild died both without male issue and he succeeded to the barony on the latter's death in 1644.Having been first a leading Parliamentarian under Oliver Cromwell, he captured Sir Phelim O'Neil in 1653 and executed him for rebellion and the murder of his brother Toby and his family.In 1660, Caulfeild switched his allegiance and supported afterwards King Charles II of England, captaining a troop of horse.