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|Grid Reference||SH 61075 25479|
|Secondary Source||Merionethshire: An Inventory of the Ancient Monuments in the County By Royal Commission on the Ancient and Historical Monuments of Wales, 1921|
|Notes||Ruined summer dwelling occupied in living memory of 1913. Pronounced 'Cystyllan' or 'cystyllen' locally. Name probably relates to castellated shapes of rock formations locally. Transcribed from RCAHMW Inventory by student volunteers on 24/03/2017.|