 It is situated in the countryside of the Usk Valley, South Wales in the Brecon Beacons National Park, and is one of the largest privately owned estates in Wales.Joseph Bailey and his brother, Crawshay Bailey, had made a fortune working for their uncle, Richard Crawshay, who owned the Cyfarthfa Ironworks near Merthyr Tydfil.Joseph had bought estates in Brecknockshire, Radnorshire, Herefordshire, and Glamorganshire, including the estate of Glanusk Park in 1826.