St Mary's Priory Church, in Whitecross Street, Monmouth, Monmouthshire, Wales, is an Anglican church founded as a Benedictine priory in 1075. The current church dates mostly from the 18th and 19th centuries. It was designated a Grade II* listed building in 1952. It is one of 24 buildings on the Monmouth Heritage Trail.

Can we draw the following conclusion?
St Mary's Priory Church is the oldest building in Monmouth Heritage Trail.

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It's impossible to say