His son, the second Earl, was a supporter of King James I and served as Master of the Robes to Charles, Prince of Wales (later King Charles I). He fought in the Civil War and was killed at the Battle of Hopton Heath in 1643. He was succeeded by his son, the third Earl. He also fought as a Royalist in the Civil War and notably commanded the cavalry at the First Battle of Newbury in 1643. Lord Northampton was also Lord Lieutenant of Warwickshire and Constable of the Tower of London. His eldest son, the fourth Earl, also served as Constable of the Tower of London and as Lord Lieutenant of Warwickshire.