En'ō

was a after Ryakunin and before Ninji. This period spanned the years from February 1239 to July 1240. The reigning emperor was .

Change of era

• 1239 : The era name was changed to mark an event or a number of events. The previous era ended and a new one commenced in Ryakunin 2.

Events of the En'ō Era

• 1239 (En'ō 1, 1st month): The Daijo daijin retired from worldly concerns, taking the tonsure of a Buddhist priest.
• 1239 (En'ō 1, 2nd month): Former Emperor Go-Toba died at age 60.