Saint Colmán mac Luacháin was an early Irish abbot (7th century), founder and patron saint of Lann (Lynn, Co. Westmeath, Ireland). A Middle Irish Life was written for him in the 12th century, possibly soon after 1122, which is preserved in a single manuscript kept in the Rennes Library in Brittany. According to the Annals of Ulster, the 22nd of March (Spy Wednesday) in 1122 was the day when the saint's shrine was discovered in the burial place of Lann. Kuno Meyer, who edited the Life, suggests this event may have prompted the composition of the text shortly after 1122 and also argues that there are linguistic grounds for assigning the text to the 12th century. The frequent use of such locational adverbs as sund ("here") seem to indicate that the Life was also written at Lann.