Earls of Inchiquin First holder Morrogh O'Brien, 6th Baron and 1st earl Inchiquin * 1614 Records #3 Holders Family filter On/Off 1 Morrogh O'Brien, 6th Baron and 1st earl Inchiquin * 1614 2 William O'Brien, 2nd Earl of Inchiquin * c. 1640 William O'Brien, 3rd earl of Inchiquin * 1666 Corrections and Updates To suggest a correction or an update. Click Here