 The first bishop of whom we know anything is Quintus, who in the year 451 signed the Synodal Letter of Eusebius, Bishop of Milan, to Pope Leo I, in which the condemnation of Nestorius and Eutyches was sanctioned.In the medieval period, the bishop of Albenga was lord of the principality of Oneille and of Pietra and its dependencies.He was therefore a feudal subject of the Emperor.