Neither is identifiable as a place near Naples, which has led many scholars to think that "Nisidanum", or "of Nisida" was meant. There are no other records of a monastery there, although there were many around the Bay of Naples. Hadrian was twice offered the position of Archbishop of Canterbury by Pope Vitalian, but instead suggested Theodore of Tarsus, who then insisted that Hadrian accompany him.
It is uncertain whether "Nisidanum" refers to a specific location near Naples; this has led scholars to speculate it might mean "of Nisida." There are no other records of a monastery there, although many monasteries were present around the Bay of Naples. Hadrian was twice offered the position of Archbishop of Canterbury by Pope Vitalian but instead recommended Theodore of Tarsus, who then insisted that Hadrian accompany him.