Rhiw Llwyd is the name of an early medieval Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

 lordship which was created in the Kingdom of Gwynedd

Kingdom of Gwynedd

Gwynedd was one petty kingdom of several Welsh successor states which emerged in 5th-century post-Roman Britain in the Early Middle Ages, and later evolved into a principality during the High Middle Ages. It was based on the former Brythonic tribal lands of the Ordovices, Gangani, and the...

 in the 12th century for Tomas ap Rhodri ab Owain Gwynedd

Rhodri ab Owain Gwynedd

Rhodri ab Owain Gwynedd was prince of part of Gwynedd, one of the kingdoms of medieval Wales. He ruled from 1175 to 1195.On the death of Owain Gwynedd in 1170, fighting broke out among his nineteen sons over the division of his kingdom...

 and his successors. The location of this lordship is not certain but it seems likely it refers to a hill of the same name (meaning in Welsh

Welsh language

Welsh is a member of the Brythonic branch of the Celtic languages spoken natively in Wales, by some along the Welsh border in England, and in Y Wladfa...

 "grey slope") between Penmachno

Penmachno

Penmachno is a village in the isolated upland valley of Cwm Penmachno, 4 miles south of Betws-y-Coed in the county of Conwy, north Wales.It is renowned as the home of Bishop William Morgan , who lived at Tŷ Mawr, Y Wybrnant, near the village. He was one of the leading scholars of his day, having...

 and Ysbyty Ifan

Ysbyty Ifan

Ysbyty Ifan is a small but historic village in Conwy County Borough, north Wales. Nearly all the population speak Welsh.-History:Ysbyty Ifan, until 1189, was known as Dôl Gynwal. Then, it came to the attention of the Knights of St John, who set up a hospice...

 in Gwynedd

Gwynedd

Gwynedd is a county in north-west Wales, named after the old Kingdom of Gwynedd. Although the second biggest in terms of geographical area, it is also one of the most sparsely populated...

. The precise spelling of the name "Rhiw Llwyd" varies in historic documents, ranging from "Friw", "Friwllwyd", "Rhiwlwyd" and others.

Rhiw Llwyd is found within the ecclesiastical parish of Penmachno and is topped with a triangulation point. It is recorded in the Anwyl

Anwyl of Tywyn Family

Anwyl of Tywyn are a Welsh family who trace their descent to Owain Gwynedd. They claim direct patrilinear descent from Owain, who was King of Gwynedd from 1137 - 1170 and a scion of the royal House of Aberffraw...

 family papers that "Richard Anwyll of Havodwryd, Penmachno passed his estates in Caernarvonshire to his sisters Elizabeth and Anne Anwyl". There is a 16th century manor called Hafod Dwyryd very close to Penmachno directly beneath the hill called Rhiwlwyd - this could this have been the Anwyl's disposing of their last portion of that ancient lordship.

Richard Anwyl, son of William Lewis Anwyl is recorded as having died in 1685. The family seem to have owned Parc

Parc, Penrhyndeudraeth

Parc is the name of an ancient mansion found near the village of Croesor in the community of Llanfrothen near Penrhyndeudraeth, in Gwynedd, Wales...

(their primary home) for a long time before they sold "Havodwryd". The sisters of Richard were married and their families, Owen and Roberts, then owned Havodwryd thereafter.