sentences:  By the mid-9th century, Fiesole had been the victim of an attack of the Normans, who destroyed the archives.Bishop Donatus of Fiesole, an Irish monk, was the friend and adviser of Emperors Louis the Pious and Lothair I.He was elected after 826, served for forty-seven years, and was buried in the Cathedral of S. Zeno, where his epitaph, which he dictated personally, may still be seen.