Adamannus or Adamnanus
Adamannus or Adamnanus a Scoto-Irish priest and monk, made in 679 abbot of Hy. In 701 he was sent on a mission to Alfred, king of Northumberland, and on his return endeavored in vain to induce his countrymen to observe Easter after the Roman fashion, which he had learned in England. He then passed over into Ireland, where he persuaded nearly all the people to follow the Roman custom. From Ireland he returned to Hy, and having again tried, but with as little success, to bring his monks round to his newly-adopted views, he died there, aged 80. Sept. 23 704. He edited a Life of St. Columba, in three books, which is given by Canisius, tom. 5, part 2, p. 562 (or in the new ed.
tom. 1, p. 680); also De Locis Terrae Sanctae, libri 3, published by Serarius, at Ingolstadt, 1619, and by Mabillon, in his Saec. Bened. 3, part 2, p. 502. He is also said to have written a book, De Pascha'e Legitimo, and some canons. See Sir James Ware's Irish Writers, lib. 1, cap. 3, p. 35. — Cave, Hist. Lit. anno 679; Bede, Hist. lib. 5, cap. 16.