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Heiji (平治) was a Japanese/Chinese era name (年号,, nengō, lit. "year name") after Hōgen and before Eiryaku. This period lasted from April 1159 until January 1160.^[1] The reigning emperor was Emperor Nijō-tennō (二条天皇).^[2]

Change of era

• January 21, 1159 Heiji gannen (平治元年): The new era name was created to mark an event or series of events. The previous era ended and a new one commenced in Hōgen 4, on the 20th day of the 4th month of 1159.^[3]

Events of the Heiji era

• January 23, 1159 (Heiji 1, the 3rd day of the 1st month ): The emperor visited his father.^[4]
• January 19–May 5, 1159 (Heiji 1, 9th-26th day of the 12th month): The "Heiji Rebellion",^[5] also known as the "Heiji Insurrection" or the "Heiji War."