Callen is a Scottish saint, commemorated Nov. 28. In the parish of Rogart, in Sutherland, the church, dedicated apparently to a saint locally known as St. Callen, was repaired between 1602 and 1619. In 1630 a yearly fair, named St. Callen's, was held at Rogart. It may be that this saint is COLGA. See Forbes, Kal. Scott. Saints, p. 294.