Ancient Engern was a much larger district than today's community, comprising most of the country surrounding the middle Weser, including both flat land, as around Minden, and low hills (Holzminden).
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They were involved marginally in the wars fought by the talented Germanicus Caesar on behalf of his uncle Tiberius, emperor of Rome, against the perpetrators of the massacre of three Roman legions in the Battle of Teutoburg Forest, the year 9.
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Although the Angrivarii receive brief mention in Ptolemy (2.10) and the Germania of Tacitus (33), they appear mainly at several locations in Annales.