St Mary's Priory Church & Tithe Barn

Relatively modest-looking, St Mary's contains a remarkable treasury of aristocratic tombs within. It was founded at the same time as the castle (1087) as part of a Benedictine priory, but the present building dates mainly from the 14th century, with 15th- and 19th-century additions and alterations. In the northern transept is one of the most important medieval carvings in Europe – a monumental 15th-century wooden representation of the biblical figure of Jesse.

The priory's 13th century tithe barn has recently been restored and converted into an excellent heritage centre and a food hall focusing on locally sourced Welsh products.