- The King's Inns admission papers record Henry Mannix, only son of Henry Mannix of Cork, who was created a baronet in 1787. The death of Sir Henry Mannix, Baronet, of Richmond, county Cork, and of Eastwood, Tenby, Pembrokeshire, aged 83, is recorded in ''The Gentleman's Magazine'' in 1823 (Vol 133, page 84). The title became extinct on the death of Sir Henry. Henry Mannix of Richmond, a magistrate, in the mid 19th century, may have been his nephew. At the time of Griffith's Valuation Henry Mannix held land in the parishes of Caherduggan, barony of Fermoy and Ballyspillane and Caherlag, barony of Barrymore. Over 1,500 acres the estate of Henry and William Mannix in the baronies of Barrymore and Cork were advertised for sale in August 1854, including Maryborough. An estate of 413 acres belonging to Charlotte Mannix and Willliam Mannix, an infant, at Kilcully, barony of Cork and in the town of Youghal was offered for sale in May 1857. In January 1873 the estate of Arthur Hinde, trustee of the will of Henry Mannix, deceased, and Maria Mannix, widow and executrix of Henry Mannix, comprised of 1,100 acres in the baronies of Barrymore, Cork and Fermoy, including Maryborough, were advertised for sale. The purchasers included Messers. Myers, O'Kearney and Larkin, in trust. In the 1870s the representatives of Henry Mannix of Dunkettle, Glanmire,owned 851 acres in county Cork.