An'ei (安永) was a Japanese era name (年号,, nengō,, lit. "year name") after Meiwa and before Tenmei. This period started in November 1772 and ended in March 1781.[1] During this time, the emperors were Go-Momozono-tennō (後桃園天皇)[2] and Kōkaku-tennō (光格天皇).[3]
The nengōAn'ei means "Eternal Tranquility"[4] or "Peaceful and Long".[5]