Before he was able to turn his attention to the West, and just after the crisis of the Persian war had passed, Justinian was exposed to a sharp and sudden danger, the most perilous experience of his whole career. We have already spoken at some length of the rivalries of the Blue and Green factions,[10] and explained how, in the early sixth century, the Greens were reckoned heterodox and supporters of the house of Anastasius, while the Blues were orthodox and favoured Justinus and his nephew. Accident conspired with the innate turbulence of the factions to stir them up into fierce disorder in the year 532, and brought about the celebrated ‘Nika’ sedition. To provide for the expenses of the Persian war, Justinian had not only drawn upon the hoarded wealth of Anastasius, but had imposed heavy additional taxation. This act made his instruments the Quaestor Tribonian and the Praetorian Prefect John of Cappadocia very unpopular. Both of them were suspected—and not incorrectly—of having used the opportunity to fill their pockets at the expense of the public, and John the Cappadocian had made himself particularly odious by his cruel treatment of defaulting debtors. In January 532 there were riotous scenes in the circus, caused by the protests of the Greens against the oppression they were suffering. There soon followed tumults in the streets, and the factions settled their grievances with bludgeon and knife. [Sidenote: The ‘Nika’ Sedition, 532.] Justinian often allowed the Blues a free hand in dealing with their adversaries, but, on this occasion, his supporters had gone too far. The police seized many ring-leaders of both factions, and seven of the chiefs were condemned to the axe or the cord. While an angry crowd stood round, five of the rioters were put to death, but when the last two, a Blue and a Green, were being hung, the cord slipped twice, owing to the nervousness of the executioner, and the criminals fell to the ground. The populace then burst through the police and hurried off the men to sanctuary in a neighbouring monastery. This incident proved the beginning of a fearful uproar. Instead of dispersing, the mobs paraded the place shouting for the dismissal of the unpopular ministers John and Tribonian. Blues and Greens united in the cry, the whole city poured out into the streets, and the police were trampled down and driven away. Footnote 10: See page 50.