Radbod 1 demanded that Willibrord 1 explain his actions, to which the latter made a robust response.
Primary Source Info
Persons associated with this Event:
(King of the Frisians, d.719) : [Willibrord 1] was called to the king [sc. Radbod 1] and very angrily asked by him why he had violated his sacred things and done injury to his god. The king [subsequently] replied in admiration [to Willibrord 1's response] that he saw that Willibrord 1 did not fear his threats and his words matched his deeds.
(Missionary; archbishop of the Frisians, 695-739; abbot of Echternach, 697/698-739) : The herald of truth [sc. Willibrord 1] replied with a steadiness of mind that it was not God whom [Radbod 1] worshipped but the Devil.