In April 2010 a large hoard of third-century Roman coins was unearthed in a field near the town. From AD 950 to 1650, Frome was larger than Bath and originally grew due to the wool and cloth industry. It later diversified into metal-working and printing, although these have declined. The town grew substantially in the 20th century but still retains a very large number of listed buildings, and most of the centre falls within a conservation area.