Heiji (平治) was a Japanese/Chinese era name (年号,,nengō, lit. "year name") after Hōgen and before Eiryaku. This period spanned the years from April 1159 through January 1160. The reigning emperor was Emperor Nijō-tennō (二条天皇).
January 21, 1159Heiji 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.
Events of the Heiji era
January 23, 1159 (Heiji 1, the 3rd day of the 1st month ): The emperor visited his father.
January 19–May 5, 1159 (Heiji 1, 9th-26th day of the 12th month): The "Heiji Rebellion", also known as the "Heiji Insurrection" or the "Heiji War."