According to historical documents, Enniskillen Castle was built in 1428 by the said to be ruling Maguire clan. The Maguires are believed to have risen to the seat of Lough Erne at the end of the thirteenth century. They were religious and not fighters, and thought to be vassals chiefs of the O’Neill and O’Donnel dynasties. The concept of vassalage is an agreement which formalises a hegemonic relationship. The Celtic era may have been disintegrating, there being reports of inter-tribal fighting. The Maguires are said to have had to take sides and are believed to have supported the O’Neills. During the as called nine year war which began in 1593, the Gaels and the Celts fought together against, thought to be English rule. They were defeated, marking the end of Celtic Ireland. Niall O’Donnel is said to have made a deal with the crown. Still, he did not get on with the crown and his wife left him in favour of family loyalties. With his son Naughton, who was said to have studied at Oxford University, he was arrested and imprisoned in the tower of London; believed to be in 1609. Niall is reported to have died there in 1626. Naughton is believed to have also died in confinement.