I think it must be sought in the higher teaching, which, under widely differing external mediums, included elements common to both. In both cults the final aim was the attainment of spiritual and eternal life. Moreover, both possessed essential features which admitted, if they did not encourage, an assimilation with Christianity. Both of them, if forced to yield ground to their powerful rival, could, with a fair show of reason, claim that they had been not vanquished, but fulfilled, that their teaching had, in Christianity, attained its normal term.

The extracts given above will show the striking analogy between the higher doctrine of Mithraism, and the fundamental teaching of its great rival, a resemblance that was fully admitted, and which became the subject of heated polemic. Greek philosophers did not hesitate to establish a parallel entirely favourable to Mithraism, while Christian apologists insisted that such resemblances were the work of the Devil, a line of argument which, as we have seen above, they had already adopted with regard to the older Mysteries. It is a matter of historical fact that at one moment the religious fate of the West hung in the balance, and it was an open question whether Mithraism or Christianity would be the dominant Creed.[8]

On the other hand we have also seen that certainly one early Christian sect, the Naassenes, while equally regarding the Logos as the centre of their belief, held the equivalent deity to be Attis, and frequented the Phrygian Mysteries as the most direct source of spiritual enlightenment, while the teaching as to the Death and Resurrection of the god, and the celebration of a Mystic Feast, in which the worshippers partook of the Food and Drink of Eternal Life, offered parallels to Christian doctrine and practice to the full as striking as any to be found in the Persian faith.

I would therefore submit that it was rather through the medium of their inner, Esoteric, teaching, that the two faiths, so different in their external practice, preserved so close and intimate a connection and that, by the medium of that same Esoteric teaching, both alike came into contact with Christianity, and, in the case of the Phrygian cult, could, and actually did, claim identity with it.

Baudissin in his work above referred to suggests that the Adonis cult owed its popularity to its higher, rather than to its lower, elements, to its suggestion of ever-renewing life, rather than to the satisfaction of physical desire to be found in it.[9] Later evidence seems to prove that he judged correctly.

We may also note that the Attis Mysteries were utilized by the priests of Mithra for the initiation of women who were originally excluded from the cult of the Persian god. Cumont remarks that this, an absolute rule in the Western communities, seems to have had exceptions in the Eastern.[10] Is it possible that the passage quoted in the previous chapter, in which Perceval is informed that no woman may speak of the Grail, is due to contamination with the Mithra worship? It does not appear to be in harmony with the prominent position assigned to women in the Grail ritual, the introduction of a female Grail messenger, or the fact that (with the exception of Merlin in the Borron text) it is invariably a maiden who directs the hero on his road to the Grail castle, or reproaches him for his failure there.

But there is little doubt that, separately, or in conjunction, both cults travelled to the furthest borders of the Roman Empire. The medium of transmission is very fully discussed by Cumont in both of the works referred to. The channel appears to have been three-fold. First, commercial, through the medium of Syrian merchants. As ardently religious as practically business-like, the Syrians introduced their native deities wherever they penetrated, "founding their chapels at the same time as their counting-houses."[11]

Secondly, there was social penetration—by means of the Asiatic slaves, who formed a part of most Roman households, and the State employés, such as officers of customs, army paymasters, etc., largely recruited from Oriental sources.

Thirdly, and most important, were the soldiers, the foreign legions, who, drawn mostly from the Eastern parts of the Empire, brought their native deities with them. Cumont signalizes as the most active agents of the dispersion of the cult of Mithra, Soldiers, Slaves, and Merchants.[12]

As far North as Hadrian's Dyke there has been found an inscription in verse in honour of the goddess of Hierapolis, the author a prefect, probably, Cumont remarks, the officer of a cohort of Hamii, stationed in this distant spot. Dedications to Melkart and Astarte have been found at Corbridge near Newcastle. The Mithraic remains are practically confined to garrison centres, London, York, Chester, Caerleon-on-Usk, and along Hadrian's Dyke.[13] From the highly interesting map attached to the Study, giving the sites of ascertained Mithraic remains, there seems to have been such a centre in Pembrokeshire.