The Massacre of the Latins (; ), a massacre of the Roman Catholic or "Latin" inhabitants of Constantinople by the usurper Andronikos Komnenos and his supporters in May 1182, had effect on the politics between Western Europe and the Byzantine Empire and led to sack of Thessalonica by Normans. Although regular trade agreements were soon resumed between Byzantine and Latin States, some Westerners sought some form of revenge. However, because of previous siege of a Catholic Zara, revenge is disputable as a significant motive.