Japanese era from January 857 to April 859 From Wikipedia, the free encyclopedia
Ten'an (天安) was a Japanese era name (年号,, nengō,, lit. "year name") after Saikō and before Jōgan. This period started in February 857 and ended in April 859.[1] During this time, the emperors were Montoku-tennō (文徳天皇) and Seiwa-tennō (清和天皇).[2]
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