Rev. Alban Butler (171173). Volume X: October. The Lives of the Saints. 1866.
St. Donatus, Bishop of Fiesoli, in Tuscany, Confessor
HE was a pious and learned Scot, or Irishman, who, going a pilgrim to Rome, was stopped in Tuscany, and by compulsion made bishop of Fiesoli, in 816, which see he governed with admirable sanctity and wisdom. See his life compiled by Francis Callanius, bishop of Fiesoli; also the Roman Martyrology on this day; and Colgan, Act. SS. Hib. p. 237, n. 3.