Henry Jermyn, 3rd Baron Jermyn, 1st Baron Dover, Earl of Dover (in the Jacobite peerage) PC (c. 1636–1708) was the second son of Sir Thomas Jermyn, of Rushbrooke, Suffolk, who died in 1659, and his wife Rebecca Rodway, who married secondly William, 1st Viscount Brouncker. He m. Judith Poley, daughter of Sir Edmund Poley, of Badley, Suffolk, and they had no children.
He surpassed his uncle, Lord St Albans, in reputation for profligacy and was the lover of Lady Castlemaine, Lady Shrewsbury, Miss Jennings and other beauties of the court of Charles II of England. A Roman Catholic, he enjoyed a position of influence with James, who on his accession raised Jermyn to the Peerage of England in 1685 as Baron Dover in the county of Kent, and appointed him Lieutenant-General of the Royal Guard in 1686. He was one of the first Catholics to be admitted to the Privy Council of England.
After the Glorious Revolution, he followed James abroad, and in July 1689 the deposed sovereign created him Baron Jermyn of Royston, Baron Ipswich, Viscount Cheveley and Earl of Dover in the Jacobite Peerage. He commanded a troop at the Battle of the Boyne, but shortly afterwards made his submission to King William III and spent the rest of his life living quietly at his London townhouse, or at his country estate Cheveley, near Newmarket. He succeeded his brother Thomas as 3rd Baron Jermyn in 1703, and died in 1708 without children, all his titles became extinct at his death.
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