Colman (Mocholmoc) of Dromore - This article says that Colman was born at Argyll in about 516 and died about 610. - http://www.saintpatrickdc.org/ss/0607.htm#moch
St. Colman of Dromore - Article suggests that Colman founded a monastery in Dromore in about 514, and died mid-sixth century. - http://www.catholic.org/saints/saint.php?saint_id=611
St. Colman, Bishop of Dromore - From Alban Butler's Lives of the Saints. This article weighs in with the opinion that the saint was born in about 516 and died around 610. - http://www.ewtn.com/library/MARY/COLMAN.htm
St. Colman - First bishop and patron saint of Dromore. Born in Dalaradia c. 450, date of death uncertain, feast day 7 June. - http://www.newadvent.org/cathen/04115d.htm