Plas Dinas is a Grade II listed building in Bontnewydd, Gwynedd, near Caernarfon in North Wales, between the Welsh coast and the Snowdonia mountains.

[5][4] In the early 20th century his son, barrister and education pioneer Sir Owen Roberts, lived at Plas Dinas when he was not occupied in England.

[4] When the Armstrong-Jones family moved to the London area, they retained Plas Dinas as their country home.

[1] Princess Margaret, who was married to Lord Snowdon from 1960 to 1978, spent many weekends at Plas Dinas with him,[14] particularly after Snowdon was appointed Constable of Caernarfon Castle in 1963, and later was designing and organising the investiture of Prince Charles as Prince of Wales,[15][16][17] which was held at Caernarfon Castle in 1969.

[9][2] The hotel includes a restaurant, The Gunroom, which contains the original early 17th-century stone fireplace that the mansion was built around over the centuries.