But how can this be harmonized with the statement that "fifteen quasi-generations had passed in this wickedness" (§ 19)? Obviously a "quasi-generation" is not a generation of human life: apart from the facts just mentioned, the very word _quasi_ forbids the supposition. Colgan (_Trias_, p. 301) suggested that the word indicates the period of office of a coarb; and this is very probable. The figure of generations, so applied, is in line with St. Bernard's conception of a bishop as "the seed" of his predecessor (§ 34). But the first of a series of coarbs, of which Murtough was the fifteenth, was Maelcoba, the second predecessor of Joseph. So that, even on Colgan's hypothesis, St. Bernard's two statements are irreconcilable. Yet it is difficult to believe that an error so manifest was in his source. I suggest that he wrote "fifteen" in error for "twelve": in other words his document had _xii_, and he misread it _xu_. The confusion of _u_ with _ii_ is very common in manuscripts. If this explanation is accepted, St. Bernard's authority implied that the hereditary succession was upheld without interruption from the death of Joseph to the accession of Murtough, which is "well-nigh two hundred years." This investigation may convince us that St. Bernard depended on an excellent document for his knowledge of the history of Armagh. But he certainly went astray in the interpretation of the document when he styled the predecessors of Cellach metropolitans (see p. 45, n. 1). And he goes further when he asserts that none were allowed to be bishops who were not of their family (§ 19); thus leaving the impression that under the rule of the eight lay abbots--that is, for a century and a half--Armagh was deprived of episcopal ministrations. But this is wholly unhistorical. The Ulster Annals mention six bishops of Armagh, contemporary with the lay abbots. They seem to have followed one another in regular succession, and there is no indication that any one of them belonged to the Clann Sinaich. They were no doubt monastic bishops, such as are found in the Irish Church from the sixth century onwards, who exercised the functions of their order at the bidding of the abbots. They were probably not referred to in St. Bernard's document; and if they were, one who had been trained in an entirely different ecclesiastical system would have been at a loss to understand their position. Thus we conclude that St. Bernard, in the passage which we are considering, used good material with conscientious care, but that he was misled by lack of knowledge of Irish ecclesiastical methods. This result is important because it may apparently be applied to the whole of his memoir of St. Malachy. His statements, as a rule, stand well the test of comparison with the native records; and when he is at fault we can usually explain his errors as misunderstandings, due to ignorance of conditions of which he had no experience.