The Uchiha Clan Massacre is an event that took place five years before the start of the series:
Background:
Following the Demon raposa Attack of Konoha, Konoha's leadership began to suspect that an Uchiha was behind the attack. In order to keep an eye on the Uchiha they were forced to live in a small corner of Konoha, creating dissent within the clan. When members of the clan began planning a coup d'état, Itachi Uchiha was tasked with spying on Konoha. Instead, Itachi became a double agent and provided Konoha with information of the Uchiha. Hiruzen Sarutobi tried to open negotiations with the Uchiha,...
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