Plas Machynlleth is the former Welsh residence of the Marquesses of Londonderry. It is situated in the market town of Machynlleth in Powys , Wales. It was brought into the family following the 1846 marriage of the then Viscount Seaham to Mary Cornelia Edwards, who inherited it on the death of her father, Sir John Edwards, in 1850. Sir John had extended and renamed the house. It is a Grade II* listed building.
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Address: Machynlleth, Powys, United Kingdom
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