Eien (永延) was a Japanese era after Kanna and before Eiso. This period spanned the years from April 987 through August 988. The reigning emperor was Ichijō-tennō (一条天皇).
Change of era
• January 2, 987 : The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced in Kanna 3, on the 5th day of the 4th month in the year 987. ==Events of Eien era==
Events of Eien era
• 987 (Eien 1, 10th month): The emperor paid a visit to the home of Fujiwara no Kaneie. • 987 (Eien 1, 11th month): The emperor visited Iwashimizu Hachiman-gū. ==Notes==