to the Uí Néill. Clan Mackintosh reported to be related to the O'Neill Clan McGovern Clan McGuinness Clan intermarried with the O'Neill Clan McCausland Clan claim descent from the Cenel Eoghain race in County Londonderry and Tyrone, a branch of the Ui Neil. O'Murphy Clan claim descent from the Northern Uí Néill O'Mahony Clan. Married into the O'Brian Clan. O'Reilly Clan. The clan were part of the Connachta's Uí Briúin Bréifne kindred and were closely related to the Ó Ruairc (O'Rourkes) of West Bréifne. O'Rourke Clan. They claim descent from High King of Ireland Eochaid Mugmedon through his son Brión (whence the Uí Briúin), the half-brother of High King Niall of the Nine Hostages, the acclaimed ancestor of the Uí Néill. Síol Muireadaigh Clan related to the Uí Néill. O'Toole Clan intermarried with the Uí Néill. See also O'Neill baronets Sir Neil O'Neill, 2nd Baronet Battle of St. George's Caye List of Colonial Governors of Florida Eoin MacNeill Jack O'Neill (businessman) James P. O'Neill NYPD Commissioner Ralph Ambrose O'Neill Air Ace Richard W. O'Neill {Medal of Honor} William Owen Buckey O'Neill soldier and lawman Places O'Neill Hall Shane's Castle Tullyhogue Fort Related O'Cahan O'Higgins family Branches of the Cenél nEógain Northern Uí Néill Southern Uí Néill Irish nobility Ambrosio O'Higgins, 1st Marquis of Osorno descended from the O'Neill dynasty MacShane, McShane, Sir William Johnson, 1st Baronet Of New York an O'Neill branch King Brian Boru of the Uí Briúin an Irish dynasty of Connacht. Their eponymous apical ancestor was Brión, son of Eochaid Mugmedon and Mongfind, and an elder half brother of Niall of the Nine Hostages. The Rival O'Rourke and O'Reilly Clans also claim descent from the Uí Briúin The Scottish MacDonald Clan claims descent from Conn of the Hundred Battles an ancestor of Niall of the Nine Hostages; allegedly the MacQueen Clan claims the same descent as the MacDonald Clan References Bibliography Mémorial Historique et Généalogique de la Maison O’Neill de Tyrone et de Claneboy, published by Bergerac, Imprimerie Générale du Sud-Ouest (J. Castanet), 3 rue Saint-Esprit, Bergerac, France, 1899. The Spanish Monarchy and Irish Mercenaries, R.A.Stradling The O' Neills in Spain, Spanish Knights of Irish Origin, Destruction by Peace, Micheline Kerney Walsh. The Irish Sword, Vol 4–11 Erin's Blood Royal: The Gaelic Nobel Dynasties of Ireland, Peter Berresford Ellis The Wild Geese, Mark G. McLaughlin. Wild Geese in Spanish Flanders,1582–1700, B. Jennings. General History of Martinique, 1650–1699