A "Vita" sometimes attributed to St. Coelan of Inishcaltra in the early 7th century derives further speculation from the fact that a foreword was added, ostensibly in a subsequent edition, by St. Donatus, also an Irish monk, who became Bishop of Fiesole in 824. In his foreword, Donatus refers to earlier biographies by St. Ultan and St. Ailerán. The manuscript of "Vita" III, as it has come to be known, was preserved in the Italian monastery of Monte Cassino until its destruction during World War II. As the language used is not that of St. Coelan's time, philologists remain uncertain of both its authorship and century of origin.