O
Oakley, 419
Oberlahngau - Counts, 314, 639
Oberrheingau - Counts, 723
OBOTRITES - Princes & Kings, 213, 511
O'BRIEN - Kings of Munster and Thomond, 123, 124, 133, 273, 274, 283, 284, 420, 511, 570
O'Brien Ara, 570
O'Byrne, 397
O'Callaghan, 570
O'Carroll, 132, 275
O'Cathan of Ulster, 366
Occimiano - Marcheses, 455
Ochiltree - Lairds of, 344
Ochterlony, 319
O'CONNOR - Kings of Connaught, Lords of Kerry, 122, 277, 512, 516
O'Connor Corcoran, 514
O'Connor of Derrymullen, 279
O'Cromin, 422
Odingsells - Lords of, 67, 87, 328
Odo, Bishop of Bayeux, 122, 190, 393
O'Donnell - Chiefs of Tirconnell, 515
O'Donoghue of Glenfisk, 421
O'Donoghue of Killarney, 513
Odorney - Barons, 283
OENINGEN - Counts, 231, 335, 525
Offaly - Barons, 274
O'Flaherty, 124
O'Fogarty, 512, 513
Ogento, 23
Ogiers, 62
Ogilvy - Baronets, 518
OGILVY - Barons, Earls of Airlie & Findlater, 118, 202, 319, 321, 325, 351, 405, 517
Ogilvy - Lairds of, 324
O'Grady, 658
Ogston, 4, 350
O'Hyne - Princes of Fiachra Aidhne, 512
OILLEY, 199, 429, 481, 525
Oisy - Seigneurs, 48, 73, 81, 86, 590
Okehampton - Lords of, 50, 194, 196
O'KENNEDY - Lords of Muscry Tire, 277, 422, 514, 520
Oldenburg - Counts, 509
O'Leary, 531
Olethan - Lords of, 56, 57
Oliphant, 117, 325, 375
Oliver Castle - Lairds of, 348
O'MAHONY (See under Munster, Kings), 422, 482, 520
Omayyid Caliphs, 478, 479
O'Mulloy, Lords of Fircall., 512
O'NEILL - Kings of Ailech, Brega, Meath and (Tara) Ireland, 275, 515, 520
ORANGE - Comtes & Princes (See also under Baux), 59, 60, 253, 526
Orbec - Seigneurs, 109, 178
Orchardfield - Lairds of, 343
Ordsal - Lords of, 228
O'Reilly, 132
Orescuitz, Lord of Cernecote, 345
Orford - Lords of, 677
Orgemont - Barons, 466
ORKNEY - Jarls, 270, 366, 469, 527
ORLAMUNDA - Counts, 528, 711
Orléans - Marquises, 302
Orléans - Merovingian Kings, 444
Orléans - Vicomtes & Ducs, 30, 159, 247, 253, 290, 297, 300, 301, 302, 303, 312, 352, 603, 696, 723, 724
Ormidale - Lairds of, 150
ORMONDE - Earls (See under Butler), 131, 222, 528
Ormonde - Marquesses, 614
ORONTID Dynasty (See under Armenia), 33
Orreby - Lords of, 539, 719
ORSEOLO (See under Venice), 144
ORSINI (See under Cephalonia and Epirus), 140, 147, 166, 256, 437, 438, 618
ORTENBERG - Counts, 499, 528, 631
Ortengen - Counts, 106, 653
Ortigen, 509
O'Ruairc, 425
Orval - Seigneurs, 8, 556
Osborne, 253
Osdola, 675
Osona - Condes, 54
Osrhoene - Kings, 537
Ossetia - Princes, 382, 699
OSSORY - Kings & Princes, 523, 528
Ossory - Lords of, 105
Ostervant - Counts, 13, 250, 305, 677, 692
Ostmark - Margraves, 604
OSTROGOTHS - Kings, 443, 529
Ostrowizza - Counts, 200
O'SULLIVAN MORE - Lords of Dunkerron, 421, 422, 483, 530
Oswestry - Lords of, 7, 100
O'TOOLE of Leinster, 531
Otter - Lairds of, 150
OTTOMAN Dynasty, 147, 148, 531
Ouest Rasen - Seigneurs, 535
Oughtred, 621
OUILLY (See under Oilley), 57, 429
OULTREJOURDAIN - Seigneurs, 534
Ourem - Counts, 559
Overburie, 379
Oviedo - Condes, 42, 490
Ovrutsch - Princes, 699
Owen, 88
Oxenbridge, 88
OXFORD - Earls (See under Vere), 235, 534
Oxnam - Lairds of, 379