Bernard of Vienne was a ninth-century Benedictine monk who served as the archbishop of Vienne starting in 810. Originally a soldier serving under Charlemagne, the loss of his parents influenced him to dedicate his wealth to charitable causes, including support for the church and the poor. After purchasing the monastery at Ambronay, where he acted as abbot, he eventually rose to his episcopal position. He remained a supporter of Frankish imperial unity throughout his career, even aligning with Lothair I during political tensions with Louis the Pious.