Experts believe that they have uncovered the remains of a medieval city which disappeared 700 years ago near Trellech in Monmouthshire. Archaeologists have unearthed two buildings dating back to the 1200s. Historical evidence shows that one of the largest settlements in Wales during 13th century is somewhere in the area. But archaeologists have said the exact location has never been pin-pointed, and they hope that the excavations have revealed the lost city. Stuart Wilson, who is part of Monmouth Archaeological Society, said he was convinced the dig would reveal further evidence of the city's existence a few miles south of the present-day village of Trellech. "For a long time, we thought the city was near the church in the village," he said. "But we found nothing during our excavations so we started looking elsewhere." Groups of volunteers have unearthed the remains of two dwellings which they think could be part of the 400-house city, undetected for the past seven centuries. "I say it's a city because it had so many more burgages [houses] than Cardiff at the time of its existence," said Mr Wilson.