Keiun (慶雲), also known as Kyōun, was a Japanese era name (年号,, nengō,, lit. "year name") following Taihō and preceding Wadō. The period startedin May 704 and ended in January 708.[1] The reigning emperors were Mommu-tennō (文武天皇)[2] and Gemmei-tennō (元明天皇).[3]