Enchō (延長?) was a Japanese era name (年号,, nengō,?, lit. "year name") after Engi and before Jōhei. This period spanned the years from April 923 through April 931. The reigning emperors were Emperor Daigo-tennō (醍醐天皇?) and Emperor Suzaku-tennō (朱雀天皇?).
Read more about Enchō: Change of Era, Events of The Enchō Era