Bemoaning the capture and enslavement of newly Christianised Irish and their sale to non-Christians, Patrick includes the imprecation:[1] Soldiers whom I no longer call my fellow citizens, or citizens of the Roman saints, but fellow citizens of the devils, in consequence of their evil deeds; who live in death, after the hostile rite of the barbarians; associates of the Scots and Apostate Picts; desirous of glutting themselves with the blood of innocent Christians, multitudes of whom I have begotten in God and confirmed in Christ.In the letter Patrick announces that he has excommunicated Coroticus's men.
The identification of Coroticus with Ceretic Guletic is based largely on an 8th-century gloss to Patrick's letter.
The Northern Picts of Fortriu were later converted by Saint Columba in the 6th century, and as they were not yet Christian, they could not be called "apostate".
[5]: 53–55 The list also includes the names of his father (Cynloyp), grandfather (Cinhil) and great-grandfather (Cluim).
In the Book of Armagh, he is called "Coirthech rex Aloo", "Ceretic, King of the Height [of the Clyde]".