Strathclyde had been within the Roman Province : the famous wall between the Clyde and the Forth, shutting off the northern barbarians, ended not far from Dumbarton. The inhabitants were Britons, that is Cymric or Welsh Celts, and their language was probably not different from modern Welsh. They must have received, to some extent, the impress of Ptoman civilisation, and even some knowledge of Christianity from the missionaries that followed the train of the imperial armies.