Waningus was a Merovingian count and royal official who served under Clotaire III during the 7th century. Born in Rouen, he held the position of governor for the Pays de Caux in Neustria. Known for his piety, he eventually left his courtly life to support monastic foundations. He played a significant role in the creation of Fontenelle Abbey alongside Wandrille and later established the Abbey of the Holy Trinity in Fécamp for nuns.