4. Certain linguistic facts are best explained, as Zimmer has ably pointed out, by the unofficial introduction of Christianity from Britain. A number of Irish ecclesiastical loan-words have forms which are “not such as we should expect if they had been borrowed straight from Latin,” but can only be explained by intermediate Brythonic forms.[409] Zimmer says: “It is altogether incredible that the Latin loan-words in Old Irish should have been introduced by Patrick and his Romance-speaking companions from the Continent after A.D. 432. On the other hand, their linguistic form is easily explained if Christianity was gradually spread throughout Ireland in the fourth century by Irish-speaking Britons.” The words, “gradually spread throughout Ireland,” are far too strong, and are not required for the argument; but it is clear that the linguistic facts in question harmonise with the testimony of Prosper, and enable us to draw the further inference that the introduction of Christianity was due to intercourse with Britain. We may go further and conjecture that the transformation of the Brythonic Latin loan-words into Irish equivalents was made in the Irish settlements in western Britain, which must have been the most effective channel for the transmission of the Christian faith to Ireland. 5. The attitude of king Loigaire (see below, Appendix C, 11) to Christianity shows that it had become a force with which he had to come to terms. If it had been first brought by Patrick, he could easily have stopped its spreading in his own kingdom, and would doubtless have done so, since personally he was not well disposed to it, and the Druids were strongly against it. His policy implies that it had already taken root. 6. The circumstance that Patrick’s missionary work was in the north and west of Ireland suggests that Christianity had made considerable progress in the south, and an apostle was not needed there in the same way. As Zimmer says (_ib._ 18), south-eastern Ireland in the kingdom of Laigin was “the district whence, thanks to the intercourse with the south-west of Britain, the first diffusion of Christianity in Ireland must naturally have taken place.” As for the Lives of alleged pre-Patrician saints (Ailbe, Ibar, Declan, Ciarán), they are so full of contradictions and inconsistencies, as Todd demonstrated, that they are useless for historical purposes. The only hypothesis on which any significance could be ascribed to them is that there was a confusion between earlier and later men of the same name. This hypothesis is too uncertain to build on; but we should have to entertain it if we accepted Zimmer’s remark that the contradictions in the Lives “are the natural result of attempting to varnish facts derived from _genuine local tradition_ with the views universally accepted at the time when the Lives were compiled.”