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Roscommon, market and county town (seat), County Roscommon, Ireland, lying northwest of Dublin. A monastery and school were established on the site in the 7th century by St. Coman. In the town and its environs are the remains of a Dominican abbey founded in 1253 by Felim O’Connor, king of Connacht, and a Norman castle built in 1269 by the justiciar of Ireland. The modern Roman Catholic church is noted for its mosaics and stained-glass...