An analysis of the Homily on the Epiphany in the Catechesis Cracoviensis in the Cracow, Cathedral Library MS 140 (olim 43). The paper searches for both patristic and Hiberno-Latin sources of exegetical themes within it. A study of the text is followed by an analysis of the Magi scenes on Irish high crosses to establish the usefulness of iconography in uncovering the provenance of a written text.