Joined Nov 2008
2,795 Posts | 1,085+
England
There is some debate amongst academics about the actual Germanic language spoken by the Anglo-Saxon migrants/invaders during the fifth century. The minority opinion is that there was a common ancestor that was spoken in northern Germany which these academics call Anglo-Frisian, so if you are interested then please read these two papers. Best to read Kortlandt`s paper first before tackling Colleran`s more specialist paper.
(4) (PDF) Old English and Old Frisian | Frederik Kortlandt - Academia.edu
Colleran2017.pdf (ed.ac.uk)
(4) (PDF) Old English and Old Frisian | Frederik Kortlandt - Academia.edu
Colleran2017.pdf (ed.ac.uk)