Background
He was the son of Arthur Capell, 1st Earl of Essex (1631-1683) by his wife Elizabeth Percy, a daughter of Algernon Percy, 10th Earl of Northumberland.
He was the son of Arthur Capell, 1st Earl of Essex (1631-1683) by his wife Elizabeth Percy, a daughter of Algernon Percy, 10th Earl of Northumberland.
He held the office of Gentleman of the Bedchamber to King William III between 1691 and 1702. He was Colonel of the 4th Dragoons between 1693 and 1710 and in 1708 was made a Privy Counselor by Queen Anne.