Extracted from a Nineteenth Century volume on Irish Saints: “Moved by missionary zeal, like many others of his countrymen, Saint Tanco or Tanchon left the island of his birth (Ireland), to spread the Christian faith amongst strangers. He traveled to Saxony. There is said to have been another Tanco, a monk of St. Gall, who must be distinguished from the present holy martyr. St. Patto had vacated the office of abbot, over a monastery, named Amarbaric, near Verden. This establishment, founded for the use of Scottish or Irish monks, is mistaken by Colgan, for the Irish Armagh, on account of a supposed similarity between these names; he thinking, that Amarbaricensis was intended for Armachanensis. As he found no other monastery, having the former name, in either Ireland or Scotland, where he supposed it must be situated, he thus conjectured, this latter famous primatial city might have been meant. The pious Tanchon succeeded this saint, as Abbot of Amarbaric, and on Patto’s death, he likewise became Bishop of Verden. This is referred to the year 760, or thereabouts, by Arnold Wion. However, this appears too early a date, as it precedes even the erection of Verden into an episcopal see, according to the most authentic accounts. Tanco, who is also called Tatta, served God many years in Amarbarica Abbey, in great reputation for his singular learning and piety. He was raised, it is said, to the dignity of abbot. Through an ardent thirst after martyrdom, he resigned this charge. The holy missioner Tanchon was animated with a hope of shedding his blood for the sake of his Divine Master. Being desirous of reclaiming the morals of the Saxon people, he fearlessly applied himself towards this task and, he is said, by the writer already named, to have received a crown of martyrdom at their hands. He ascended gloriously to Heaven, on the xiv. day of the Kalends of March, or the 16th of February, about the year of our Lord 800. His dalmatic was long preserved, as a precious relic, in the church of Verden. Tanco is said to have been a holy man, a diligent observer of ecclesiastical decorum; a man who left a great reputation behind him for learning, but a still greater for sanctity.”
So now you know, when ecstatically enjoying ridiculous reruns of Sister Bertrille funnily flying over the Emerald Isle of the Caribbean, Puerto Rico, that the nonexistent nunnery to which she beneficently belonged was named after an authentically approved Saint!