 The names of other bishops up to the Norman conquest have not been preserved.Buono (1223) was assassinated by a cleric; Lamberto Arbaudo (1509) embellished the cathedral, which was demolished a little later to permit the erection of fortifications.In 1818 the diocese of Lavello, suffragan to the archdiocese of Bari, founded in 1042 when the Norman count Arnichino fixed his seat at Lavello, was united to Venosa.