was there any evidence of romans living in historical times in that town?
Yes, it may have been the site of the Roman settlement of Trajectus,
Keynsham
Evidence of occupation dates back to prehistoric times, and during the Roman period, Keynsham may have been the site of the Roman settlement of Trajectus, 
what is keynsham? It is a town and civil parish. in which country is it located? England.
wiki:19103264
Keynsham [SEP] Roman Trajectus
Evidence of occupation dates back to prehistoric times, and during the Roman period, Keynsham may have been the site of the Roman settlement of Trajectus, which is the Latin word for "bridgehead." It is believed that a settlement around a Roman ford over the River Avon existed somewhere in the vicinity, and the numerous Roman ruins discovered in Keynsham make it a likely candidate for this lost settlement. In 1877 during construction of the Durley Hill Cemetery, the remains of a grand Roman villa with over 30 rooms was discovered. However, construction of the cemetery went ahead, and the majority of the villa is now located beneath the Victorian cemetery and an adjacent road.