The Gothic War began as part of Byzantine Emperor
Justinian's goal to restore former
Western Roman territories to Byzantine control. It started with the successful reconquest of
North Africa in the
Vandalic War (533–534). In early 535, tensions in the
Gothic kingdom escalated following the assassination of Queen
Amalasuntha, who had maintained good relations with the Byzantines and even considered handing her kingdom over to them, and were further weakened by internal leadership struggles that continued under King
Theodahad. Justinian used Amalasuntha's death as a diplomatic pretext for military intervention. He first dispatched
Mundus, the general (
Magister Militum) of
Illyricum region, to seize
Salona, the capital of
Dalmatia region, and sent General
Belisarius to invade
Sicily. The Goths struggled to resist these multi-front offensives, as Justinian had also secured an alliance with the
Franks, who sought to expand into Gothic territories. Mundus captured Salona, and in response, the Goths assembled an army under
Asinarius and
Gripas to retake the city. As this army approached the city, Mundus sent his son
Mauricius on a
reconnaissance mission; however, in a skirmish, Mauricius died. Mundus, being grief-stricken upon the news, marched against the Goths, where he decisively routed them, but he also died in pursuit of the routed Gothic forces. The leaderless Byzantine forces did not return to Salona and instead went home. The Goths, having suffered considerable losses, retreated to nearby
forts and did not try to secure Salona as they considered it difficult to hold with its inhabitants being hostile to them. Upon the news about the events in Dalmatia, Theodahad detained the Byzantine ambassadors in close confinement. In response, Justinian sent
Constantinianus, his cavalry commander (
Count of the Stable), to recover Dalmatia. He sailed from
Dyrrhachium to
Ragusa, after which he easily captured Salona in March 536 since the Goths had retreated upon learning that a large Byzantine force landed in Dalmatia. Constantinianus started repairing the walls, which were in disrepair. At the same time, Belisarius marched from Sicily to southern Italy
capturing Naples and many other regions, which welcomed the Byzantines. In December of 536, he entered
Rome unopposed, returning the city under Byzantine control after sixty years. The Byzantine successes led the Goths to turn against their king, who was soon deposed and later killed. The newly crowned king,
Vitiges, started to galvanize the Goths and create a large army against the Byzantines. Before marching against Rome, Vitiges sent an army under Asinarius and
Uligisalus to recover Dalmatia. He also sent with them a large number of warships, presumably the royal fleet of
Ravenna, with the intention to
blockade and besiege the city from the seaside. == Military actions ==