Medieval Welsh Royal Court is now a scheduled monument

Although little remains of Llys Rhosyr today, in the 13th and 14th centuries this site was an important court of the Princes of Gwynedd. Cadw, the Welsh Government’s historic environment service has now made the site its 131st scheduled monument.

Located near Newborough in northwest Wales, Llys Rhosyr was in use between 1237 and 1314 as a residence of the Welsh princes and served as a law court. However, after Edward I’s conquest of Wales it fell into decline. In 1332 the site was buried in a  sandstorm and remained lost for centuries.


In 2022 the site was purchased by Cadw for £17,000 so it could be preserved and protected for present and future generations. It also still has archaeological importance.

“I’m delighted that we’ve been able to purchase this significant site in Welsh history,” says Dawn Bowden, the Welsh Deputy Minister for Arts and Sport. “Cadw will now start work to ensure the site is properly conserved and accessible for all to appreciate.”.


Two of the court buildings from Llys Rhosyr have been recreated at St Fagans as Llys Llewelyn. Created in 2018, these are interesting illustrations of experimental archaeology in action and help to introduce people to the world of medieval Wales.

Nia Williams, Cadw’s Director of Learning and Public Programmes, explains, “Llys Llywelyn was built as part of the redevelopment of St Fagans National Museum of History. It brings the experience of a Royal Court of the Princes of Gwynedd to life for our visitors. It is a popular building and is used for many events such as music gigs, medieval feasts and sleepovers. We look forward to collaborating with Cadw and continuing the relationship between the local Llys Rhosyr community on Anglesey and the recreation of the Llys here at St Fagans.”

Llys Rhosyr is open to the public and free to visit. To learn more about Llys Rhosyr and Llys Llywelyn, please visit the Cadw website.

Top Image: Photo by Chris Andrews / Wikimedia Commons / CC BY-SA 2.0