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Jian (治安) was a Japanese era name (年号,, nengō,, lit. "year name"), also known as Chi'an, after Kannin and before Manju. This period spanned the years from February 1021^[1] through July 1024.^[2] The reigning emperor was Go-Ichijō-tennō (後一条天皇).^[3]

Change of Era

• 1021 Jian gannen (治安元年): The era name was changed to mark an event or series of events. The previous era ended and a new one commenced in Kannin 5, on the 2nd day of the 2nd month of 1021.^[4]

Events of the Jian era

• 1023 (Jian 3, 4th month): An epidemic in Kyoto was so severe that there were corpses in the streets;^[5] disease spread throughout the country.^[6]
• 1023 (Jian 3, 10th month): Fujiwara no Michinaga visits Mt. Koya.^[7]
• December 29, 1023 (Jian 3, 14th day of the 11th month): a lunar eclipse.^[8]