The Ampsivarii reference article from the English Wikipedia on 24-Apr-2004
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Ampsivarii

The Ampsivarii were a Germanic tribe mentioned by the Roman author Tacitus, writing in the 1st century C.E. Their homeland was located in what is now northwestern Germany around the river Ems, which flows into the North Sea. Tacitus' name for them is is a Latin rendering of the Germanic "Ems-werer", meaning "men of the Ems".