Gen'ei (元永?) was a Japanese era name (年号,, nengō,?, lit. "year name") after Eikyū and before Hōan. This period spanned the years from April 1118 through April 1120. The reigning emperor was Emperor Toba-tennō (鳥羽天皇?).
Read more about Gen'ei: Change of Era, Events of The Gen'ei Era