Who ruled Frisia in the mid-ninth century?

An important article setting out the reasons for retaining the traditional view that Lothar I and II ruled the whole of Frisia between 840 and 869, from the Sincfal to the Weser, not just the western part as has been proposed by a number of historians in recent years. The weakness of the arguments for the revisionist case is exposed, texts supporting Lothar's rule are cited, and a hitherto untapped source of evidence - Carolingian coin finds - is shown to offer strong support to the case for the traditional view.