Adamnan

Adamnan, or Adomnan, a native of Ireland, who flourished about 624 to 704, and was Abbot of Iona during the last twenty-five years of his life. He tried in vain to induce his monks to adopt the observance of Easter according to the Roman Calendar, and he wrote two curious books : a Life of St. Columba, and a treatise, Le Situ Terrae Sanctae.