a town in Southern Italy, and see of a Roman Catholic archbishop. A considerable number of councils have been held there, among which the following are the most important: 1087, at which the Antipope Guibert was excommunicated, and the investiture by laymen forbidden; 1108, which again pronounced against the investiture by laymen; and 1117, at which Bishop Mauritius Verdinus (later Gregory VIII) was excommunicated.