Thus, of so many strange pagan superstitions we have abundant vestiges, but of Christianity in Roman Britain we have singularly few traces. It is true that here and there among undoubtedly Roman remains the Christian monogram (X P) or Christian formulæ such as _Vivas in Deo_ or _Spes in Deo_ have been met with.[23] In the recent excavations at Silchester a small building which is almost certainly a Christian basilica has also been discovered, but these are slight evidences for the existence of a faith which was certainly professed by multitudes ere the legions quitted Britain. As to the actual date of the introduction of Christianity into our island we must be contented to confess our ignorance. The story contained in the book of Papal Lives, which was reproduced by Bede, that a certain King Lucius of Britain, about the year 180, sent over to Pope Eleutherus, asking for missionaries to instruct his people in the Christian faith, must be dismissed as the fable of a later age; nor can we speak with much certainty concerning the so-called proto-martyr, St. Alban, who is said to have suffered for the faith in the persecution of Diocletian. There can be no doubt, however, that there were some converts to Christianity in Britain during the second century, and in the third century it must have become the dominant religion here as in the rest of the empire. Towards the end of that century our island, which produced so many rival Cæsars, produced also one of the most famous of heretics, Pelagius, and, of course, the existence of his heterodoxy implies also the existence of the orthodoxy out of which it sprang. Thus, though we cannot help sometimes relying on the “argument from silence,” the present condition of our archæological information concerning the existence of Christianity in Roman Britain shows us how untrustworthy may sometimes be that very argument.