Anna (era)
Anna (安和?) was a Japanese era (年号,, nengō,?, lit. "year name") after Kōhō and before Tenroku. This period spanned the years from August 968 through March 970. The reigning emperors were Reizei-tennō (冷泉天皇?) and En'yū-tennō (円融天皇?).
Read more about Anna (era): Change of Era, Events of The Anna Era