Pandenulf was the Count of Capua, claiming that title from 862 and holding it successfully during the tumultuous civil war of 879 – 882.
He was the son and successor of Pando, but was removed on his father's death by his uncle the bishop, Landulf II.
Meanwhile, Pandenulf renewed his fidelity to the papacy, hoping to use Pope John VIII as leverage against his adversaries.
Pandenulf's troops reduced the Gaetans to control only of their own peninsula, but Docibils called in the Saracens of Agropoli and retook Fondi, ravaging the papal territory.
Pandenulf was called back by events in Capua, however, and John was forced to make a treaty with Docibilis whereby the latter became a papal vassal.