Corpus of Electronic Texts Edition
Life of St. Declan of Ardmore (Author: Patrick Power)

chapter 26

As Patrick and the saints were in Cashel, i.e. Ailbe and Declan with their disciples, in the territory of Aongus Mac Nathfrich, they made much progress against paganism and errors in faith and they converted them (the pagans) to Christianity. It was ordained by Patrick and Aongus Mac Natfrich in presence of the assembly, that the Archbishopric of Munster should belong to Ailbe, and to Declan, in like manner, was ordained (committed) his own race, i.e. the Deisi, whom he had converted to be his parish and his episcopate. As the Irish should serve Patrick, so should the Deisi serve Declan as their patron, and Patrick made the rann:—

    1. Humble Ailbe the Patrick of Munster, greater than any saying,
      Declan, Patrick of the Deisi—the Decies to Declan for ever.

p.45

This is equivalent to saying that Ailbe was a second Patrick and that Declan was a second Patrick of the Decies. After that, when the king had bidden them farewell and they had all taken leave of one another, the saints returned to their respective territories to sow therein the seed of faith.