Iron King
Following the early death of the second Benjamin Hall in 1817, Hensol was put on the market in 1824 and passed to his widow's Crawshay family, Hensol being bought by her nephew, the "Iron King" of Merthyr Tydfil. William Crawshay II (1788–1867), who later built Cyfarthfa Castle. William Crawshay was High Sheriff of Glamorgan in 1829.