Why this matters
Birr Castle, located in County Offaly, was originally built in the 15th century by the Butler family, Earls of Ormond, and later expanded in the 17th century by the Parsons family, who held it as part of their extensive estate. It is remembered for its historic astronomical observatory, built in the 18th century by the 3rd Earl of Rosse, which was once the largest telescope in the world.
What is recorded here
Birr Castle is recorded as a castle in County Offaly. Its open map record supplies this location and any linked names or public references.
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