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.
[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').
Their territory was situated north of the Saevates and Laianci, south of the Alauni, and east of the Breuni and Cosuanetes.
[6] They are mentioned by Pliny the Elder as one of the Alpine tribes conquered by Rome in 16–15 BC, and whose name was engraved on the Tropaeum Alpium.