The English monk and historian Bede mentions Abercorn as the site of a monastery and seat of Bishop Trumwine who was the only bishop of the Northumbrian see of the Picts. The monastery is now known to have existed close to the present day church. The church itself dates partially from the 12th century, although its most interesting features are the private aisles created for the three major families of the area, the Dalyells, the Hamiltons, and later the Hopes, who had their own enclosure behind the altar built by architect William Bruce. The Hope mausoleum, designed by William Burn, is located adjacent to the kirkyard. Older burial monuments include Norsemen "hogback" stones, and fragments of 7th century Northumbrian crosses.