Rhos-on-Sea

Rhos-on-Sea is a seaside resort and community in Conwy County Borough, Wales. The population was 7,593 at the 2011 census. It adjoins Colwyn Bay and is named after the Welsh kingdom of Rhos established there in late Roman Britain as a sub-kingdom of Gwynedd. It later became a cantref .

Bryn Euryn is a hill overlooking Rhos-on-Sea on which there are the remains of a hillfort called Dinerth, the 'fort of the bear', and a limestone quarry. Ednyfed Fychan, 13th century seneschal to Llywelyn the Great and ancestor to the House of Tudor was granted the land and built a castle on the hill, of which all traces have disappeared, and a manor, Llys Euryn of which the ruins of its 15th-century reconstruction can be seen today.

Wikipedia