Clytha is a hamlet and historical area in Monmouthshire, Wales. ==Overview== It lies just off the A40 road, to the south of Llanarth and west of Raglan. It contains Clytha Park and Clytha Castle and Llanarth Estate Office, Ty Gwynt and Pit House. The castle, the park and The Clytha Arms public house, however, lie on the southern side of the A40. T...