Our first reference in history to Ninian (c.360 - c.432), is from the 8th century when Bede mentions him as the first Christian missionary among the Picts in Scotland. Supposedly he was a son of a Briton chieftain who made a pilgrimage to Rome, was made a bishop, and then headed home through Gaul where he met Martin of Tours. Modern scholarship supports the idea that in 397 he built a whitewashed stone church at what is now called Whithorn ("White House"; in Latin it was called Candida Casa) in Caledonia, which became a leading Anglo-Saxon monastic center.
He was considered a miracle worker. In one instance, sitting to dine with the monks, he remarked that there were no vegetables on the table and called the monk in charge of the gardens, who informed Ninian that he had just planted the garden that morning and nothing had yet grown. Ninian sent him to the garden, whereupon the monk found that there were plenty of full-grown leeks and other herbs. In another anecdote, the traveling Ninian blesses a herd of cows and draws a circle in the field with his staff to keep them contained and safe for the night. Thieves who attempt to steal the herd find their leader gored to death by the bull and the rest made mad. Ninian in the morning prays to God to restore the dead man and restore the others. Ninian's prayer is successful.
St. Patrick, whose missionary work followed Ninian's by a few decades, refers to the Picts in his "Letter to Coroticus" as "apostates" (people who revert from their faith), suggesting that Ninian's seeds did not take permanent root:
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.
The northern Picts were converted by St. Columba, and Christianity was still strong there. The "apostate" label would have to apply to the southern Picts, so Patrick clearly was aware that there had been missionary attempts there before him.
He may have got the name wrong, however. Archeology and anthropology suggest that the story of Ninian by Bede and others may actually be the story of Finnian of Clonard, or Finbarr of Cork, or Finnian of Movilla. The fact that Ninian is referred to as Ringan in Scotland and Trynnian in Northern England also suggests that exact identification of a bishop who built the first stone church at Whithorn has its difficulties. Aelred's source for the name "Ninian" is actually a scribal error from "Ninia," which (according to one modern scholar) was itself a scribal error from early records of St. Finnian (of Movilla) spelled Uinniau.
You can read Aelred's Life of Ninian in English here. Ninian's image appears in stained glass in a church in Galloway (see illustration).
But why was Aelred so interested in this obscure saint from seven centuries earlier? During Aelred's life, Whithorn was revived as a bishopric. Did he have a reason to draw attention to the newly resurrected bishopric? It may have been a political favor. I'll explain that tomorrow.