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|Grid Reference||SH 57740 24188|
|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||Part of Ynys Gwrtheyrn farm. Probably part of the demesne of the rulers of Ystumgwern in the Welsh period. Transcribed from RCAHMW Inventory by student volunteers on 24/03/2017.|