Rev. Alban Butler (171173). Volume X: October. The Lives of the Saints. 1866.
St. Fintan, Surnamed Munnu, Abbot, in Ireland
BEING descended of the noble family of Nial, he forsook the world in his youth, and was desirous to consecrate himself to God in the great monastery of Hij, under the discipline of St. Columba; but God, for greater designs, prevented the execution of that project, and Fintan, after St. Columbas death, sailed back to Ireland, and founded a great monastery called, from him, Teach-Munnu, in the south part of Leinster, in the land of Kinselach: he was famous for his virtues, miracles, and disciples. The annals of Tigernach place his death in 634, on the 31st of October. He is commemorated in the old Scottish Breviary under the name of St. Mundus, abbot. See Usher, Ant. c. 17, p. 485; St. Adamnan, in vitâ St. Columbæ; Colgan in his Acts of the Saints of Ireland; and Britannia Sancta.