The Aedui or Haedui (Gaulish: *Aiduoi, 'the Ardent'; ) were a Gallic tribe dwelling in the modern Burgundy region during the Iron Age and the Roman period. The Aedui had an ambiguous relationship with the Roman Republic and with other Gallic tribes. In 121 BC, they appealed to Rome against the Arverni and Allobroges. During the Gallic Wars (58–50 BC), they gave valuable though not whole-hearted support to Caesar, before eventually giving lukewarm support to Vercingetorix in 52. Although they were involved in the revolts of Iulius Sacrovir in 21 AD and Vindex in 68 AD, their aristocracy became highly Romanized under the Empire. Name They are mentioned as Ardues (Ἄρδυες) by Polybius (2nd c. BC), Haedui by Cicero (mid-1st c. BC) and Caesar (mid-1st c. BC), Haeduos by Livy (late 1st c. BC), Aedui by Pliny (mid-1st c. AD), Aidúōn (Αἰδύων) by Ptolemy (2nd c. AD), and as Aídouoi (Aἴδουοι) by Cassius Dio (3rd c. AD). The ethnonym Aedui is a latinized form of Gaulish *Aiduoi (sing. *Aiduos), which means 'the Ardent ones'. It derives from the Celtic stem *aidu- ('fire, ardour'; cf. Old Irish áed 'fire', Welsh aidd 'ardour'; also the Irish deity Aéd or Aodh), itself from Proto-Indo-European ('firewood'; cf. Sanskrit édhas 'bonfire', Latin aedes 'building, temple'; cf. also Ancient Greek Aether 'god of the upper sky' and Aethra 'bright sky', from aíthō 'to ignite, to kindle'). Geography Territory The territory of the Aedui was situated between the Saône and Loire rivers, in a strategic position regarding trade routes. It included most of the modern départements of Saône-et-Loire and Nièvre, the southwestern-part of Côte-d'Or between Beaune and Saulieu, and the southern part of Yonne around Avallon, corresponding to the Saône plains, the Morvan granitic massif, and the low Nivernais plateau, from east to west. They dwelled between the Arverni in the west, the Segusiavi and Ambarri in the south, the Sequani in the east, and the Lingones and Senones in the north. Settlements Three oppida are known from the end of the La Tène period: Vieux-Dun (Dun-les-Places), Le Fou de Verdun (Lavault-de-Frétoy), and Bibracte, which occupied a central position in the Aedian economic system. During the Roman period, Bibracte was abandoned for Augustodunum ('fortress of Augustus'; modern-day Autun). Ancient sources The country of the Aedui is defined by reports of them in ancient writings. The upper Liger formed their western border, separating them from the Bituriges. The