Llys RhosyrNewborough, Anglesey

Llys Rhosyr, Newborough, Anglesey, North Wales

Llys Rhosyr is the only Royal Court House belonging to the Princes of Gwynedd to have been partially excavated. This makes it the only court of a Welsh king that you can visit in the whole of Wales! Why not explore where this historic courthouse once stood and walk in the footsteps of Llywelyn the Great?

Situated on Anglesey's southwestern corner, this medieval site highlights the often unknown story of the Princes of Gwynedd and helps to recognise their strong link to the Isle of Anglesey. With stunning countryside surrounding the site and Newborough Warren only a stone’s throw away, Llys Rhosyr is the perfect place to stop off and soak up some local history.


Of the 20 historic court sites known to have existed across Wales during the 800-year long empire of the kingdom of Gwynedd, it is the only one that has been located and excavated, making it a significant historical site both locally and nationally. Excitingly the ground plans remain virtually intact so it is still possible to see the layout of the court! 

It is believed that the site became buried in the 14th Century after a number of violent storms; it was not until another a storm hit, this time in the 18th Century, that the remains of a stone wall were revealed. Though the site remained hidden until the Gwynedd Archaeological Trust gained funding from Cadw, to investigate the lost Llysoedd (royal court compounds). The story goes that it was, in fact, a local farmer that pointed the archaeologists in the right direction when looking for this medieval spot, as he knew the field name ‘Cae Llys’ where the site was eventually uncovered. A large main hall and a building thought to have housed the Prince’s private rooms were excavated along with pottery and other artefacts which dated back to the 13th Century. It is speculated that only one-quarter of the site has actually been revealed. 

We would advise popping into the Prichard Jones Institute in Newborough village, just a 10 minute stroll from Llys Rhosyr, to see the audiovisual presentation before visiting the site. It helped us envision what we were are about to see and made us able to appreciate the site all the more. It is a great opportunity for all the family to learn a little more about the history of this wonderful island and to help keep the memory of Llywelyn the Great alive!

Opening times

Open all year.

Contact details 

Phone number:  01248 725718


Picnic spot

Yes. If you are happy to use the grass there is plenty of space to set out a picnic blanket or two but there are no seats or tables.



Not at the site. It is advisable to park in the car park on your right just as you enter Church street.


The site is accessed through a small gate and is based in a field with no hard standing paths, making it rather unsuitable for wheelchairs or pushchairs, especially if it is muddy!



Dogs are allowed but must be kept on leads.


Other useful info 

There is an exhibition and cafe at the Prichard Jones Institute in Newborough.


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