Diocletian added Helvetia, and part of Germania Superior to Sequania, which was now called Provincia Maxima Sequanorum, Vesontio receiving the title of Metropolis civitas Vesontiensium. The southern reach of this territory was known as Sapaudia, which later developed into Savoy. Fifty years later, Gaul was overrun by the barbarians, and Vesontio sacked (355 CE). Under Julian, it recovered some of its importance as a fortified town, and was able to withstand the attacks of the Vandals. Later, when Rome was no longer able to afford protection to the inhabitants of Gaul, the Sequani became merged in the newly formed Kingdom of Burgundy.