[Lat. Acheruntia]
Town and commune in the province of Potenza, southern Italy. Known for its strategic position on top of a rocky hill, it was a Roman colony and subsequently coveted by Byzantines, Goths, and Lombards. During this time it was under the authority of Benevento, and later on Salerno. It was conquered in 1043 when the city came under the rule of Asclettino I, Count of Acerenza (d 1045), brother of Ranulph, Count of Aversa (reg 1030–45), and then from 1061 Acerenza was under the control of Robert Guiscard, Duke of Apulia (reg 1059–85). It was at this time that Pope Nicholas II (reg 1058–61) elevated the city to an archbishopric. The first archbishop was Arnaldo, from Cluny, and in 1080, when the relics of St Canius were discovered, he founded a new cathedral in the centre of town, which is now the main monument. In ...