The Cantiorix Inscription is a stone grave marker of the early post-Roman era found near Ffestiniog] in north Wales and now at the church at Penmachno [1]. It is notable both as the first known historical reference to the Kingdom of Gwynedd, and for its use of the Roman terms for 'citizen' and 'magistrate'.

It is considered by some to be evidence that a Roman-style administration existed beyond the Roman departure from Britain in some form in the early Kingdom of Gwynedd (Wikipedia page [2]), while others either question or discount its significance in that regard.

More information on the Wikipedia page [3].

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