An elaborate late-Gothic window with double trefoil arch below a quatrefoil at the east end of the south aisle of St Mary’s, Gowran, County Kilkenny. The core of the present building dates from around 1275 when it was erected on the site of an earlier monastery. St Mary’s was a collegiate church, meaning it was placed under the care of a “college” of clerics who lived in a community without submitting to any specific monastic rule. Since the 19th century the chancel and central tower have served as the local Church of Ireland church while the main body has remained a picturesque ruin. The play of patterned sunlight seen here comes from the great west window at the nave end.