It was the first of Justinian I 's wars Military_operation of reconquest of the lost Western Roman Empire .

The Eastern Roman emperor Justinian took this as a pretext to interfere Hindering in Vandal affairs , and after he secured Preventing_or_letting his eastern frontier with Sassanid Persia in 532 , he began Process_start preparing GetReady an expedition under general Belisarius , whose secretary Procopius wrote Writing the main historical narrative of the war .

Justinian took advantage of , or even instigated Convincing , rebellions in the remote Vandal provinces of Sardinia and Tripolitania .