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In page Fforest Fawr:

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Following the Norman Conquest the area was owned by the Lord of Brecon, Bernard de Neufmarche, eventually passing into the possession of the Crown in 1521. It was sold by the Crown in 1819 to raise funds depleted by the cost of the Napoleonic Wars. The entrepreneur John Christie purchased some of this land and subsequently constructed a tramroad across the area from Sennybridge to Ystradgynlais in an effort to improve agricultural production though the venture ran into financial difficulties.[2]