my suggestion about the author of MV

[rasiratros]

In the Medieval context, the difference is somewhat artificial since there was a continuum of Germanic dialects. Certain authors who were active in the border regions can be "claimed" by both Dutch and German literature. In this case, however, the language seems to rule out Agrippa entirely.

Agrippa lived and worked in Cologne. From the current border with the Netherlands it is 50 km. At that time it was one country.