Japanese era from January 857 to April 859

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]

Events of the Ten'an era

In Ten'an 2, the start of Seiwa's reign was announced at Kotai-jinju in Ise
  • 15 December 858 (Ten'an 2, 7th day of the 11th month): The emperor's grandfather is named regent (sesshō).[3]


  1. Nussbaum, Louis-Frédéric. (2005). "Ten'an" in Japan Encyclopedia, p. 957.
  2. Titsingh, Isaac. (1834). Annales des empereurs du japon, pp. 112-115; Brown, Delmer et al. (1979). Gukanshō, pp. 264-265; Varley, H. Paul. (1980). Jinnō Shōtōki, p. 165.
  3. 3.0 3.1 3.2 Titsingh, pp. 115; Brown, p. 286; Imperial Household Agency (Kunaichō), 文徳天皇 (55); retrieved 2012-5-22.
  4. Varley, p. 44; a distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Go-Toba, and Fushimi have senso and sokui in the same year until the reign of Emperor Go-Murakami. Compare Imperial Household Agency (Kunaichō), Ceremony of Accession (Sokui-no-Rei); retrieved 2012-2-16.

Other websites


Ten'an 1st 2nd 3rd
857 858 859
Preceded by:
Era or nengō:
Succeeded by: