Siadhail (d 813) was Abbot'Monasticum Hibernicum; or, an history of the abbeys, priories, and other religious houses in Ireland' Archdall, M. (Dublin: printed for Luke White, 1786) and possibly Bishop of Roscommon in the 9th century:“A New History of Ireland” T. W. Moody, F. X. Martin, F.J. Byrne and Cosgrove, A: Oxford, OUP, 1976
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