A. = Frisian migration to mainland of Northern Frisia (11th century)
1. = Expansion/return of Rhine Weser Germanic (Low Franconian/Old Dutch)̠ 7th century onwards.
2. = Expansion/return of Rhine Weser Germanic/North Sea Germanic mix (Old Saxon)̠ High Medieval Period onwards.
Source
Map is based on Elmar Seebold: Die Herkunft der Franken, Friesen und Sachsen, in: Essays on the Early Franks, Barkhuis, the Netherlands, 2003, pp. 24-29.
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Captions
The emergence of the modern Anglo-Frisian languages following the migration period.