O’Cairbre, Dairmaid
O Flaithearta, Liam
O’Neill clan, Ireland
Oakbank crannog
Ogilvy, James
oil industry
Oliphant, Sir William
Oliphant family
Ordinances of 1305
Orkney
Alexander II
Croune of Orkney
Gurness
Haakon IV, King of Norway
James III, of Scotland, claimed by
Maes Howe
Papa Westray, Knap of Howar
Skara Brae
Viking invaders
Orkney, Henry Sinclair, Earl of
Orléans, Phillipe, Duc d’
Ormsby, William