Along the coast they lived on artificial hills called terpen, built high enough to remain dry during the highest tide.
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He said that they were "wretched natives" living on a barren coast in small cottages (or huts) on hilltops, or on mounds of turf built high enough to stay dry during the highest tide (i.e., terpen).
The earliest mention of the Frisii tells of Drusus' 12 BC war against the Rhine Germans and the Chauci.