He established the seat of his cathedral in the town called Glesgu, which is translated “Beloved Family,” and is now called Glasgow. And there he gathered together many servants of God, a family beloved and well known to God, who lived in abstinence following the pattern of the primitive church under the Apostles, without possessions and in holy discipline and divine service.
And the diocese of that episcopate extended to the borders of the Cambrian kingdom, and that kingdom stretched continuously from sea to sea, just like the earthen wall built by the Emperor Severus. After the advice and counsel of the Roman legions, in order to prevent the Picts from rushing into the country, a wall was constructed in this same place that was eight feet wide and twelve feet tall, and it reached up to the river Forth, and divides Scotland from England as a boundary line. And this Cambrian region over which Kentigern now was placed with episcopal honor, had received the Christian faith (as had the whole of Britain) during the time of Pope Eleutherius, when King Lucius ruled. But when the pagans had attacked the island during various times, and having dominion over it, the islanders had thrown away the faith they had received by falling into apostasy. Many also were not yet washed in the health-giving water of baptism, and many were stained by the contagion of manifold heresies. Many, only Christian in name, were wrapped up in the hog pool of multiple vices. Very many had been taught by ministers inexperiened in and ignorant of the law of God. And for these reasons, all the inhabitants of the province had a need for the counsel of a good shepherd, and the cure of a good ruler. Therefore God, the Disposer and Dispenser of all good things, provided, preferred, and proposed Saint Kentigern as a healing remedy, as the sustenance of life and the example, for all the diseases of all the people.
— Jocelin of Furness, Life of St. Kentigern, Chapter XI.