 Complete the following phrase:  Procopius was with Belisarius on the eastern front until the latter was defeated at the Battle of Callinicum in 531 and recalled to Constantinople. Procopius witnessed the Nika riots of January, 532, which Belisarius and his fellow general Mundus repressed with a massacre in the Hippodrome. In 533, he accompanied Belisarius on his victorious expedition against the Vandal kingdom in North Africa, took part in the capture of Carthage, and remained in Africa with Belisariuss successor Solomon the Eunuch when Belisarius returned east to the capital. Procopius recorded a few of the extreme weather events of 535536, although these were presented as a backdrop to Byzantine military activities, such as a mutiny in and around Carthage. He rejoined Belisarius for his campaign against the Ostrogothic kingdom in Italy and experienced the 