It is much more probable, however, that he was a bishop, and his successors, though frequently styled abbots, seem to have been in episcopal orders; and all of them certainly exercised episcopal jurisdiction. The school of Clonard, too, for many centuries retained its ancient fame, and from time to time produced distinguished saints and scholars. St. Aileran the Wise, who, like many other Irish saints, died of the fatal yellow plague that devastated the country in A.D. 664, is described as chief professor of the schools of Clonard. He was also, in Colgan's opinion, the author of what is known as the _Fourth Life of St. Patrick_, as well as of _Lives of St. Brigid, and St. Fechin_ of Fore, in Westmeath. Moreover, he composed a Litany partly in Latin and partly in Irish, which O'Curry discovered in the _Yellow Book of Lecain_ in Trinity College. Fleming, too, has published a fragment of a Latin treatise by St. Aileran on the "_Mystical Interpretation of the Ancestry of our Lord Jesus Christ_." This fragment was found in the Irish monastery of St. Gall in Switzerland. It was first published by Fleming in A.D. 1667, and reprinted in the famous Benedictine edition of the Fathers in A.D. 1677. It may, perhaps, with greater readiness be referred to in _Migne's Patrology_ (vol. 80, page 328). We make special reference to this fragment because we have no other writings of the Clonard school remaining, either of St. Finnian himself or of his immediate successors; and secondly because of itself it furnishes ample proof of the high culture attained at that early age in this great Irish seminary. The Benedictine editors say that although the writer did not belong to their order, they publish it because Aileran "unfolded the meaning of Sacred Scripture with so much learning and ingenuity that every student of the sacred volume, and especially preachers of the Divine Word, will regard the publication as most acceptable (acceptissima)."