Salvati Christi Corpore et sanguine, A quo refecti Laudes dicamus Deo. Hoc Sacramento Corporis et sanguinis Omnes exuti Ab inferni faucibus," etc. The legend in the Leabhar Breac has it that this hymn was first chanted during the holy communion by the angels in his church, on the reconciliation between himself and Saint Patrick, whence the origin of chanting it during the communion service. The Book of Armagh contains the two earliest lives of the national saint that we have, probably the two earliest biographies of any size ever composed in Ireland. They are written in rude Latin, with a good deal of Irish place-names and Irish words intermixed, the first by one Muirchu Maccu Machteni,[28] who tells us that he wrote at the instigation of Aed, bishop of Sletty, who, as we know from the "Four Masters," died about 698, and the second by Tirechan, who says he received his knowledge of the saint from the lips and writings of Bishop Ultan,[29] his tutor, who died in 656, and who, supposing him to have been seventy or eighty years old at the time of his death, must have been born only eighty or ninety years after the death of St. Patrick himself. Both of these writers appear to have had older memoirs to draw on, for Muirchu says that many had before them endeavoured to write the history of St. Patrick from what their fathers and those who were ministers of the Word from the beginning had told them, though none had ever succeeded in producing a proper biography,[30] and in Tirechan's life of him in the Book of Armagh--an evident patchwork--we read that all his godly doings had been brought together[31] and collected by the most skilful of the ancients. The first of these lives consists of two books containing twenty-eight and thirteen short chapters, respectively, the second, Tirechan's, of one book containing fifty-seven chapters, in addition to which there are a number of minor notes referring to St. Patrick in Latin and in Irish, which Ferdomnach, who transcribed the book in 807, appears to have taken from other old lives or memoirs of the saint. The Irish portions of these notes are of peculiar interest, as showing what the Irish language was, as written about the year 800.[32]