Avellino, Diocese of.—An Italian diocese in the Province of Naples, suffragan to Benevento. Avellino was founded by St. Sabinus, martyr, in the beginning of the second century. The list of bishops dates from 1124. The Diocese of Frigento, whose list is from 1080 to 1455, was united with that of Avellino from May 9, 1466, until June 27, 1818, when it was suppressed. Avellino was vacant from 1782 to 1792. It has 118,649 Catholics; 41 parishes, 243 secular priests, 11 regulars, 80 seminarians, 90 churches and chapels.