Chagnoald was a 7th-century Frankish bishop belonging to the Faronid family. As the son of Chagneric, the chancellor to Dagobert I, he was the brother of Saint Faro and Saint Burgundofara. After serving as a monk at Luxeuil, he rose to become the bishop of Laon. Throughout his career, he remained a close associate of the missionary Columbanus, traveling with him and participating in significant ecclesiastical events such as the Council of Reims in 630.