Tag this record Born / Died Birth Date: 1590-00-00Death Date: 1657-00-00 Parents Marriages/Other Unions Fermor, Mary (1591/2 - 1675)Type: marriageUnion began: n.d.Union ended: n.d. Offspring From Fermor, Mary (1591/2 - 1675)Female offspring: O'Brien, Penelope (1622 - 1702) Primary Title 6th Earl of Thomond Titles 6th Earl of Thomond Details of Offices Bibliographic Sources View a list of abbreviations. The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom. 1887–98 (8 vols); 1910–59 (13 vols). 6 vols. Gloucester: Alan Sutton, 1982 Oxford Dictionary of National Biography.