The Angrivarii (or Angrivari) were a Germanic people of the early Roman Empire, who lived in what is now northwest Germany near the middle of the Weser river.
The Angrivarii lived in an area which was later called Angria (Modern German "Engern") in the Middle Ages, which was a major part of the Carolingian Duchy of Saxony.
Among the more detailed mentions of the Angrivarii which Tacitus makes in his Annals, he describes them also as neighbours to the powerful Cherusci people, of Arminius, who apparently lived east of them.
Its precise etymology remains unclear, but there is a general consensus that it cannot be derived from the PIE root *wihxrós, "man", surviving in English "were-wolf".
[7] Their geographical-based name is associated with the 8th century region called Angria (Angaria, Angeriensis, Aggerimensis and Engaria), which was one of four subdivisions of Old Saxony (the others were Westfalahi and Ostfalahi and Nordalbingia).
This region is now referred to in modern German as Engern, and it corresponds reasonably well with the area where the Angrivarii lived, comprising most of the country surrounding the middle Weser, including both flat land, as around Minden, and low hills (Holzminden).
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 the Teutoburg Forest, the year 9.
Germanicus found it necessary to pacify the border, which he did by a combination of scorched earth raids and offers of alliance with Rome - in short, stick and carrot.
The Angrivarii's defection or revolt (defectio) in the middle of Arminius's renewed operations against the Teutoburg Forest must have been secured in advance by Germanicus.
This later reaped dividends for the Angrivarii played a major role in securing the return of ships and men lost in a North Sea storm which scattered the Roman fleet upon the shore of hostile or neutral Germanic tribes.
[13] Arminius died and the Angrivarii, the other west Germans and their successor tribes continued friendly towards Rome, providing it with elite troops and urban and palace police.