Rhos-on-Sea also known as Llandrillo-yn-Rhos in Welsh, or Rhos or Llandrillo (not to be confused with Llandrillo, Denbighshire), is a seaside resort in Conwy County Borough, Wales. The population was 7,110 in 2001. It is a mile to the northwest but effectively a suburb of Colwyn Bay, on the coast of North Wales. It is named after the Welsh kingdom of Rhos established there in late Roman times as a sub-kingdom of Gwynedd, and later became a cantref (hundred).
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