Ambisontes
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The Ambisontes (Gaulish: 'those around the Isontia') were a Gallic tribe dwelling in the upper Salzach valley during the Roman period.
They are mentioned as Ambisontes by Pliny (1st c. AD),[1] and as Ambēsóntioi (Ἀμβησόντιοι) by Ptolemy (2nd c. AD).[2]
The Gaulish ethnonym Ambisontes means 'the people from around the Isontia', stemming from the root *amb(i)- ('around, on both sides') attached to the name of the river Isontia (modern Salzach).[3][4] The hydronym itself, while not necessarily Celtic, is most likely of Indo-European origin, and can be derived from the stem *[h₁]ish₁-ont- ('she who moves quickly').[5]