In Constantinople of 532 AD chariot races were the most important form of entertainment. There were 2 major teams which called themselves Blue or Green and it was not uncommon for the supporters to kill each other.
In January 532 however, things escalated so much that eventually emperor Justinian was almost forced to leave the city. In an uprising indirectly caused by chariot racing, 30’000 people were killed and half of the city was burned.
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Photo Credits / Sources:
See Unknown author [Public domain], via Wikimedia Commons.