Chateau Rhianfa is a Grade II*-listed hotel and former mansion in Anglesey, North Wales.

Originally the house was intended to provide a residence for William's wife and daughters in the event of his death.

The house remained in the possession of the Williams family until 1957 when it was sold and converted into a number of apartments.

Most of the land surrounding the house was also sold, leaving three acres attached to the estate.

[3] The Williams family had travelled extensively in the Loire region of France and drew inspiration for their home from the chateaux they observed there.