Bubo (died 734),[1] also spelled Bobbo, Poppo or Popo, was the pagan[2] duke (dux) of the Frisians in the early eighth century.
[4] The inhabitants gave hostages, converted to Christianity and recognised Frankish overlordship, but after Charles left they were punished by their fellow Frisians.
Initial landings on Westergo and Ostergo[5] encountered no resistance, since Charles's aim was to bring Bubo to heel.
[4] Charles and Bubo's armies met on the banks of the river Boorne, perhaps at Oldeboorne, one of the Frisians' chief commercial centers at the time.
Charles ordered the shrines (fana) to be destroyed and carried back to Francia "a great mass of spoils" (magna spolia et praeda).