Clovis I and the Merovingian Dynasty
The Franks possessed the delta land at the mouths of the Scheldt and Rhine streams.
In around 350, they got to be Roman federati and were permitted to use land that was in the south of the Rhine, in what are presently the southern-Netherlands and the north of Belgium.
No doubt ocean level fluctuates after some time, and the higher or lower water level has an extraordinary impact upon low-lying terrains, for example, those Franks possessed.
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