The remains of the Roman fort and the medieval churches are evidence of its importance in earlier times, but it could hardly claim the title of town until the nineteenth century.
Mae olion y gaer Rufeinig a’r eglwysi canoloesol yn dystiolaeth o’i phwysigrwydd mewn cyfnodau cynharach, ond o’r braidd y gallai hawlio teitl tref tan y bedwaredd ganrif ar bymtheg.