English: Errigle Church and Cross, Errigle, Augher Co Tyrone. The cross is on the left. This important early Christian site is believed to have been founded by St. Adhamhnan (Onan). In the 7th century Adhamhnan held the position of Abbot of Iona after St. Colmcille and wrote a biography of the saint. The site now consists of the ruined remains of a medieval parish church in a walled graveyard and a stone structure which may have been a watchman's house or burial vault. There is also a rock-cut souterrain (man-made underground cave) in the adjoining field. Beyond the walled graveyard is a bullaun stone marking a possible ancient entrance to the church precincts. The Souterrain was excavated in 1935 revealing a number of chambers, passages and objects including a sharpening stone and a wooden club. The findings suggest that it was used as a refuge in times of danger and it is recorded that the church was attacked by Norse raiders in the Ninth Century. http://www.shee-eire.com/Sites&Monuments/Celtic-Cross/Tyrone/Errigle-Kerroge/EgeKreccinfo.htm