==Events and Trends== 532 — Nika riots in Constantinople; the cathedral was destroyed. They were put down a week later by Belisarius and Mundus; up to 30,000 people were killed in the Hippodrome. Hagia Sophia, Constantinople, rebuilt (532–537) Under the leadership of the Byzantine Emperor Justinian I, general Belisarius fought many campaigns defeating, among others, the Vandals in North Africa, bringing their kingdom to an end. During the climate changes of 535–536, the… (More on 530s)