Ó Duinnshléibhe was one of two Donegal men named Father Muiris Ulltach who attended Aodh Ruadh Ó Domhnaill (d. 1602) on his death-bed in Simancas Castle, Spain, with Archbishop of Tuam Fláithrí Ó Maol Chonaire.
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In the 1630s both he and Muiris mac Seaán Ulltach Ó Duinnshléibhe were attached to the Franciscan convent at Bundrowes, and became acquainted with Mícheál Ó Cléirigh, who was then compiling the Annals of the Four Masters.