Aided by Father Hugh Ward, O.F.M., Father Stephen White, S.J., and Brother Míchél Ó Cléirigh, O.F.M., Colgan sedulously collected enormous material for the Lives of the Irish Saints, and at length, after thirty years of sifting and digesting his materials, put to press his Acta Sanctorum Hiberniae, a portion of the expense of which was defrayed by Archbishop O'Reilly of Armagh.
Sanctum Sanctorum | Acta Eruditorum | sanctum sanctorum | Acta Diurna | Acta Sanctorum Hiberniae | Acta Chimica Slovenica | Acta Apostolicae Sedis |
The 17th-century hagiographer John Colgan, in his Acta Sanctorum Hiberniae (Louvain, 1645) says that he was living in 818, and gives the date of Clement's death as 20 March and the place as Auxerre, where he was interred in the church of Saint-Amator.