Man'en (万延) was a Japanese era name (年号,, nengō,, lit. "year name") after Ansei and before Bunkyū. This period started in March 1860 and ended in February 1861.[1] During this time, the emperor was Kōmei-tennō (孝明天皇).[2]
The nengō Tenpō means "Ten Thousand Years Prolonged"[3]