Massacre of the Latins
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The Massacre of the Latins was a large-scale massacre of the Roman Catholic inhabitants of Constantinople, the capital of the Eastern Roman Empire, by the Eastern Orthodox population of the city in April 1182.
The Roman Catholics of Constantinople... Wikipedia
Start date: April 1182
Deaths: several tens of thousands
Perpetrators: Andronikos Komnenos, Greek Eastern Christian mob
Location: Byzantine Empire and Constantinople