Ferdulf or Fardulf, originally from the territories of Liguria, was the Duke of Friuli at some point between the reign of Cuninpert (688-700) and Aripert II (701-12).
Paul the Deacon described him as 'a man tricky and conceited' (Latin: homo lubricus et elatus) who had obtained the dukedom after the death of Duke Ado.
Argait (whose name means 'cowardly, inert or worthless' in Langobardic), the local magistrate, or 'sculdahis', chased them, but could not overtake them.
The conversation between Ferdulf and Argait is said by Paul to have been undertaken in 'vulgaria verba' and may indicate that Langobardic was still a spoken vernacular in the north-east of Italy.
While Paul's source for this story is unknown, and he provides no further notice regarding Ferdulf, it is likely that it depends upon oral traditions that he may have encountered in Friuli.