The site on which Barryscourt castle now stands has been occupied for over a thousand years- there is evidence of a wooden watermill having been built next to a stream at the site sometime in the 7th century, long before any fortification existed there. Barryscourt fell into the hands of the Anglo-Norman de Barry family in the 12th century, and masonry from this period found at the site may be the remains of another watermill or possibly an early fortification built by the Barrys.