name include: Murrigan, Murrin, Murrain, Merrigan, Murricane, Murrigain, Maragan, Merrigan, Marrican, O'Murrigan, O'Murrin, O'Merrigan, O'Murricane, O'Murrigain, O'Merrigan, O'Merrigan, O'Merregan and many more. First found in Longford , where they held a family seat as chiefs where with a castle at Rathcline. After the Norman Conquest of England , Irish history was