The Istvaeones, also called Istaevones, are mentioned as a Germanic tribal grouping in the writings of Tacitus and Pliny the Elder (~1st century AD), they categorized them as one of the nations of Germanic tribes descended from one of the sons of Mannus, the other two such peoples were the Ingvaeones and who?
Ingaevones: The Ingaevones or North Sea Germanic peoples were a West Germanic cultural group living along the North Sea coast in the areas of Jutland, Holstein, Frisia and the Danish islands, where they had by the 1st century BCE become further differentiated to a foreigner's eye into the Frisii, Saxons, Jutes and Angles.
i don't know