The Germanic languages are traditionally divided into three groups: West, East and North Germanic. They remained mutually intelligible throughout the Migration Period. Dutch is together with English and German part of the West Germanic group, that is characterized by a number of phonological and morphological innovations not found in North and East Germanic. The West Germanic varieties of the time are generally split into three dialect groups: Ingvaeonic (North Sea Germanic), <answer>Istvaeonic</answer> (Weser-Rhine Germanic) and Irminonic (Elbe Germanic). It appears that the Frankish tribes fit primarily into the <answer>Istvaeonic</answer> dialect group with certain Ingvaeonic influences towards the northwest, still seen in modern Dutch.
Which dialect group included most Frankish tribes?
Istvaeonic