Clarendon was the only son of Edward Hyde Villiers, 5th Earl of Clarendon and his wife Lady Caroline Elizabeth Agar, daughter of James Agar, 3rd Earl of Normanton.
James Agar, 3rd Earl of Normanton (1818–1896), British Conservative Party politician
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Born Henry Welbore Agar, he was the eldest son of James Agar, 1st Viscount Clifden of Gowran Castle, Gowran, Co.