../O'Brien, Baroness Annie/
../O'Brien, Christopher Michael/
../O'Brien, His Honour Judge Daniel Joseph/
../O'Brien, Dermod/
../O'Brien, Hon. Donough Edward Foster/
../O'Brien, Hon. Donough/
../O'Brien, Edmond Lyons/
../O'Brien, Hon. Edward Donough/
../O'Brien, Colonel Eoghan/
../O'Brien, George/
../O'Brien, Capt. Hon. Henry Barnaby/
../O'Brien, John Robert/
../O'Brien, Kendal Edmund/
../O'Brien, Hon. Lucius Murrough/
../O'Brien, Lt.-Col. Hon. Murrough/
../O'Brien, Hon. Phadrig Luciue Ambrose/
../O'Brien, Sir Timothy Carew/
../O'Brien, Torlogh/
../O'Brien, Alderman William/
../O'Brien, William/
../O'Brien, Hon. William Henry Robert Ernest Turlough/
../O'Byrne, Count John Edward Gerald O'Byrne/
../O'Callaghan, Daniel/
../O'Callaghan, Mrs. Kate/
../O'Callaghan-Westropp, Col. George/
../O'Carroll, Joseph Francis/
../O'Ceallaigh, Sean T./
../O'Connell, Daniel Charles/
../O'Connell, Rev. Frederic Wm./
../O'Connell, Major James Ross/
../O'Connell, John Joseph/
../O'Connell, Sir John Robert/
../O'Connell, Capt. Sir Maurice James Arthur/
../O'Connell, Sir Peter Reilly/
../O'Connell, Lady Mary Pauline/
../O'Connell, Thomas Joseph/
../O'Connor, Arthur John/
../O'Connor, Right Hon. Charles Andrew/
../O'Connor, George Richard/
../O'Connor, Right Hon. James/
../O'Connor, Lieut.-Col. Patrick Fenelon/
../O'Connor, Thomas Power/
../O'Conor, Charles Hugh/
../O'Conor, Edmond/
../O'Conor, Lady Minna Margaret/
../O'Conor Don, The, Owen Phelim O'Conor/
../O'Doherty, Eileen/
../O'Doherty, James Edward/
../O'Doherty, Joseph/
../O'Doherty, Philip/
../O'Doherty, Most Rev. Thomas/
../O'Donnell, Charles James/
../O'Donnell, Elliot/
../O'Donnell, John/
../O'Donnell, Rev. Michael J./
../O'Donnell, Thomas (M.P. West Kerry)/
../O'Donnell, Thomas (T.D. Sligo–Mayo East)/
../O'Donnell, Lieut.-Gen. Sir Thomas Joseph/
../O'Donoghoe, Sir James/
../O'Donoghue, Geoffrey (The O'Donoghue of the Glens)/
../O'Donoghue, Tadhg/
../O'Donoghue, Thomas/
../O'Donovan, Fred/
../O'Donovan, The, Morgan William O'Donovan/
../O'Dowd, John/
../O'Duffy, General Owen/
../O'Dwyer, Sir Michael Francis/
../O'Dwyer, Robert/
../O'Farrell, Charles Richard/
../O'Farrell, Sir Edward/
../O'Farrell, Surgeon-General Thomas/
../O'Farrell, Thomas T./
../O'Farrelly, Miss Agnes/
../O'Ferrall, John Forbes/
../O'Ferrall, Dominic More-/
../O'Flaherty, Samuel/
../O'Flanagan, Reverend Michael/
../Ogilby, Lt.-Col. Robert James Leslie/
../O'Gorman, Col. Nicholas Purcell O'Gorman (The O'Gorman)/
../O'Grady, Guillamore/
../O'Grady, Major Hugh Hamon Massy/
../O'Grady, William De Rienzi O'Grady (The O'Grady)/
../O'Hara, Arthur Cooper/
../O'Hara, Charles Kean/
../O'Hara, Lt.-Col. Erril Robert/
../O'Hara, Right Rev. Henry Stewart/
../O'Hara, Colonel James/
../O'Hara, Major Patrick Henry Augustus/
../O'Higgins, Brian/
../O'Keeffe, Major-Gen. Sir Manus William/
../O'Keeffe, Patrick/
../O'Keeffe, Stephen Charles Martin Lanigan-/
../O'Kelly, De Gallagh et Tycooly, Count Gerald Edward/
../O'Kelly, Capt. Henry Kane/
../O'Kelly, John Thomas/
../O'Kelly, Sean Joseph (Sceilig)/
../O'Kelly, Rev. Thomas/
../O'Kennedy, Very Rev. Canon Richard/
../O'Leary, Daniel Henry/
../O'Loghlen, Sir Michael/
../O'Loingsigh, Fionan/
../O'Mahony, Sean/
../O'Mahony, Pierce Charles de Lacy O'Mahony (The O'Mahony)/
../O'Maille, Prof. Tomas/
../O'Maille, Padraic/
../O'Malley, Ellen/
../O'Malley-Keyes, Major Middleton/
../O'Mara, James/
../O'Mara, Joseph/
../O'Mara, Alderman Stephen Mary/
../O'Meagher, Col. John Kevin/
../O h-Aodha, Padraig/
../O'Neill, Baron/
../O'Neill, Major Edward Michael/
../O'Neill, Rev. George/
../O'Neill, Rev. John/
../O'Neill, Rev. Patrick/
../O'Neill, Right Hon. Laurence/
../O'Neill, Maire/
../O'Neill, Patrick/
../O'Neill, Rt. Hon. R. W. Hugh/
../O'Neill, Colonel William Henry Slingsby/
../O'Neill-Power, Captain John Joseph/
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