A Byzantine expeditionary fleet under Belisarios sails from Constantinople to attack the Vandals in Africa, via Greece and Sicily.

Belisarius was a military commander of the Byzantine Empire under Emperor Justinian I. Belisarius was instrumental in the reconquest of much of the Mediterranean territory belonging to the former Western Roman Empire, which had been lost less than a century prior. He is considered one of the greatest military commanders of Byzantium and in history generally.

The Vandalic War (533–534) was a conflict fought in North Africa between the forces of the Byzantine Empire and the Germanic Vandal Kingdom. It was the first war of Emperor Justinian I's Renovatio imperii Romanorum, wherein the Byzantines attempted to reassert Roman sovereignty over territory formerly controlled by the Western Roman Empire.

June 21 is the 172nd day of the year in the Gregorian calendar; 193 days remain until the end of the year.