Gundolfo

Gundolfo or Gundulf is purported to be a teacher of Proto-Protestant Christian doctrines in the early 11th century. Of Italian origin, he was said to be active in the bishopric of Cambrai-Arras in northern France (south of Lille) around 1025 during the episcopate of Bishop Gerard of Florennes.

Gundulfo rejected the sacraments and authority of the Catholic Church and claimed salvation by a righteousness based on his reading of the Gospels rather than on Catholic Church dogma. His teachings emphasized that salvation was achieved through a virtuous life of abandoning the world, restraining the appetites of the flesh, earning food by the labor of hands, doing no injury to anyone, and extending charity to everyone of their own faith.

Following a lengthy sermon by Gerard, followers of Gundulfo recanted their radical beliefs and were received back into the Church. The source of Gundolfo's teachings is unknown but may be compared to Catharism and to the Waldensians.

Details surrounding the remainder of Gundolfo's life are scarce, including when and where he died.

Historicity
Because Gundolfo and his followers are only known from a single, uncorroborated text from around 1200 in Cîteaux, a prominent monastic house battling heresy, there are doubts as to the historical veracity of Gundolfo's existence.

It is possible that the narrative of Gundulfo's followers being questioned and corrected by Bishop Gerard was a rhetorical framing device for the treatise against heresy he was already intending to publish. However, the fact that it does not contain reference to other radical positions being preached in the region lends some credibility to the figure and story having some basis in historical reality.