Francus or Francio is a mythological figure of French medieval historians which referred to a legendary eponymous king of the Franks, a descendant of the Trojans, founder of the Merovingian dynasty and forefather of Charlemagne. The Chronicle of Fredegar states Charlemange is not a descendant of Francus. In the Renaissance, Francus was generally considered to be another name for the Trojan Astyanax (son of Hector) saved from the destruction of Troy. https://en.wikipedia.org/wiki/Francus