In process of time, partly perhaps through the rationalising influences of a growing civilisation, but chiefly through the direct action of Christianity, with which he came into active contact in perhaps the fourth, or certainly in the fifth century, the remembrance of the old Gaelic theogony, and the old Gaelic deities and his religious belief in them became blunted, and although no small quantity of matter that is purely pagan, and an immense amount of matter, but slightly tinged with Christianity, has been handed down to us, yet gods, heroes, and men have been so far brought to a common level, that it is next to impossible at first sight to disentangle them or to say which is which. Very probably there was, even before the introduction of Christianity, no sharply-defined line of demarcation drawn between gods and heroes, that, in the words of Pindar, ἓν ἀνδρῶν ἓν θεῶν γένος, "one was the race of gods and men," and when in after times the early mythical history of Ireland came to be committed to parchment, its historians saw in the Irish pantheon nothing but a collection of human beings. It is thus, no doubt, that we find the Fomorians and the Tuatha De Danann posing as real people, whilst in reality it is more than likely that they figured in the scheme of Gaelic mythology as races of beneficent gods and of evil deities, or at least as races of superhuman power. The early Irish writers who redacted the mythical history of the country were no doubt imbued with the spirit of the so-called Greek "logographers," who, when collecting the Grecian myths from the poets, desired, while not eliminating the miraculous, yet to smooth away all startling discrepancies and present them in a readable and, as it were, a historical series.[12] Others no doubt wished to rationalise the early myths so far as they conveniently could, as even Herodotus shows an inclination to do with regard to the Greek marvels; and the later annalists and poets of the Irish went as far as ever went Euhemerus, reducing gods and heroes alike to the level of common men. We find Keating, who composed in Irish his Forus Feasa or History, in the first half of the seventeenth century, and who only re-writes or abbreviates what he found before him in the ancient books of the Gaels now lost, distracted between his desire to euhemerise--in other words, to make mere men of the gods and heroes--and his unflinching fidelity to his ancient texts. Thus he professes to give the names of "the most famous and _noble persons_ of the Tuatha De Danann," and amongst them he mentions "the six sons of Delbaeth, son of Ogma, namely, Fiacadh, Ollamh, Indaei, _Brian, Iuchar,_ and _Iucharba_,"[13] but in another place he quotes this verse from some of his ancient sources-- "Brian Iucharba and the great Iuchar, The _three gods_ of the sacred race of Dana, Fell at Mana on the resistless sea By the hand of Lughaidh, son of Ethlenn."