Originally the seat of the kings of Ossory (an ancient Irish kingdom), Thomastown is a pretty, stone-built village on the River Nore. It takes its name from Thomas FitzAnthony of Leinster, who encircled the town with a wall in the 13th century. Fragments of this medieval wall remain, as do the partly ruined 13th-century church of St. Mary. Mullins Castle sits adjacent to the town bridge.
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