The castle was restored by the 3rd and 4th Marquesses of Bute, who made their money from the industrialisation of south Wales in the 19th and 20th centuries.
Cafodd y castell ei adfer gan 3ydd a 4ydd Marcwis Bute, a wnaeth eu harian drwy ddiwydiannu de Cymru yn ystod y 19eg ganrif a'r 20fed ganrif.