Gondebald, the third king of the Burgundians since their entrance on Gallic soil, was sovereign in the year 500. At that time the territory of this kingdom extended from Basle to Lorraine and Champagne, included the district round Macon, reached as far as the frontiers of Auvergne, and skirting the High Alps, followed the course of the Rhône to the shores of the Mediterranean. Juliana, including the city and fortress, with the district appertaining to it, was therefore clearly in Burgundian ground. The war undertaken by Clovis against Gondebald, and the defeat of the latter near Dijon, had indeed resulted in reducing the extent of Burgundy on the north-west; but Autun and even Dijon and Langres still remained in the hands of Gondomar, the second son of Gondebald since Childebert and Clotaire came and besieged him in the first of these three cities. Gondomar had been elected king of the Burgundians, after his eldest brother Sigismund had been deposed and condemned to monastic seclusion at Orleans by the sons of Clovis. Gondomar put his tenable places in a state of defence, collected an army, and after a battle with the Franks in Dauphiny, and in which Clodomir perished, resumed peaceable possession of his kingdom. Ten years later Clotaire and Childebert made a fresh attempt to destroy the menacing power of Gondomar. They wished to associate Theodoric with them; but as he was occupied with a war in Auvergne, he refused to accompany them. The two sons of Clovis therefore directed their forces in 532 towards Burgundy, and sat down before Autun, in which the king of the Burgundians had shut himself up.
The cité was on the point of being taken; Gondomar succeeded in escaping with some of his troops, and took refuge in the cité Juliana, as one of the best munitioned strongholds of his kingdom, and the key to all the mountainous and wooded part of Burgundy.
He was hoping to keep the troops of the Franks there till winter, and then to take advantage of the rigour of the season in that district to assume the offensive, with the aid of auxiliaries promised from the East.
In fact, Clotaire and Childebert having taken Autun about the middle of the summer, led their army before the cité Juliana; for they could not think of pursuing their conquest while leaving this place on their flanks or behind them.