Tha tobhtaichean seann [[caisteal]] às na [[Meadhan aoisean]] ann an coille dìreach taobh a-muigh a' bhaile. Thug Giraldus Cambrensis (''Gerald of Wales'') iomradh air ann an 1188. Bha iomadh ainm air leithid Castell Deudraeth, Castell Gwain Goch is Castell Aber Iâ.
In 1931 Williams-Ellis bought from his uncle, [[Williams baronets|Sir Osmund Williams, Bt]], the [[Victorian architecture|Victorian]] [[Crenellation|crenellated]] mansion Castell Deudraeth with the intention of incorporating it into the Portmeirion hotel complex, but the intervention of the war and other problems prevented this. Williams-Ellis had always considered the Castell to be “the largest and most imposing single building on the Portmeirion Estate" and sought ways to incorporate it. Eventually, with support from the [[Heritage Lottery Fund]] and the [[European Regional Development Fund]] as well as the [[Wales Tourist Board]], his original aims were achieved and Castell Deudraeth was opened as an 11 bedroom hotel and restaurant on August 20, 2001 by Welsh opera singer [[Bryn Terfel]].
The grounds contain an important collection of [[rhododendron]]s and other exotic plants in a wild-garden setting, which was begun before Williams-Ellis's time by the previous owner [[George Henry Caton Haigh]] and has continued to be developed since Williams-Ellis's death.