Context : The Massacre of the Latins (Italian: Massacro dei Latini; Greek: Σφαγή των Λατίνων) was a large-scale massacre of the Roman Catholic (called ``Latin'') inhabitants of Constantinople, the capital of the Byzantine Empire, by the Eastern Orthodox population of the city in April 1182. 
Subject : Massacre of the Latins 
Relation : point in time
What is the date when Massacre of the Latins happened?