thumb|right|240px|A general map of Gwynedd showing the cantrefi. Rhufoniog is shown in the upper centre portion. Rhufoniog was a small sub-kingdom of the Dark Ages Gwynedd, and later a cantref in medieval Wales.
thumb|right|240px|A general map of Gwynedd showing the cantrefi. Rhufoniog is shown in the upper centre portion. Rhufoniog was a small sub-kingdom of the Dark Ages Gwynedd, and later a cantref in medieval Wales.
== Geography == The cantref Rhos lay between it and the Irish Sea. Sometimes the two cantrefi were linked together as "Rhos and Rhufeiniog", which roughly corresponds to the territory of the old county of Denbighshire. The rivers Elwy, Clwyd and Clywedog formed a natural border to the north and east. As today, the countryside was bleak and isolated.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).