Gundolfo or Gundulf is purported to be a teacher of Proto-Protestant Christian doctrines in the 11th century.
Of Italian origin, he was said to be active in the bishopric of Cambrai-Arras in northern France (south of Lille) around 1046 during the episcopate of Bishop Gerard of Florennes.
His teachings emphasized that salvation was achieved through a virtuous life of abandoning the world,[2] restraining the appetites of the flesh,[3] earning food by the labor of hands,[4] doing no injury to anyone, and extending charity to everyone of their own faith.
[5] 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.