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964–968	Kōhō
968–970	Anna
970–973	Tenroku
973–976	Ten'en
976–978	Jōgen
978–983	Tengen
983–985	Eikan
985–987	Kanna
987–988	Eien
988–990	Eiso
990–995	Shōryaku
995–999	Chōtoku
999–1004	Chōhō
1004–1012	Kankō
1012–1017	Chōwa
1017–1021	Kannin
1021–1024	Jian
1024–1028	Manju
1028–1037	Chōgen
1037–1040	Chōryaku

806–810	Daidō
810–824	Kōnin
824–834	Tenchō
834–848	Jōwa
848–851	Kashō
851–854	Ninju
854–857	Saikō
857–859	Ten'an
859–877	Jōgan
877–885	Gangyō
885–889	Ninna
889–898	Kanpyō
898–901	Shōtai
901–923	Engi
923–931	Enchō
931–938	Jōhei
938–947	Tengyō
947–957	Tenryaku
957–961	Tentoku
961–964	Ōwa

645–650	Taika
650–654	Hakuchi
686–686	Shuchō
701–704	Taihō
704–708	Keiun
708–715	Wadō
Nara
715–717	Reiki
717–724	Yōrō
724–729	Jinki
729–749	Tenpyō
749	Tenpyō-kanpō
749–757	Tenpyō-shōhō
757–765	Tenpyō-hōji
765–767	Tenpyō-jingo
767–770	Jingo-keiun
770–781	Hōki
781–782	Ten'ō
782–806	Enryaku

Keiun (慶雲), also known as Kyōun, was a Japanese era name (年号, nengō, "year name") following Taihō and preceding Wadō. The period spanned the years from May 704 through January 708.^[1] The reigning emperors were Monmu-tennō (文武天皇) and Genmei-tennō (元明天皇).^[2]

Change of era

704 Keiun gannen (慶雲元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Taihō 4, on the 7th day of the 5th month of 704.^[3]

Events of the Keiun era

707 (Keiun 4): Emperor Monmu dies, but his son and heir was deemed too young to receive the succession (senso). Instead, the mother of the heir formally accedes to the throne (sokui) as Empress Gemmei until her son would grow mature enough to accept senso and sokui.^[4]
18 July 707 (Keiun 4, 15th day of the 6th month): Genmei is enthroned at the age of 48.^[3]
707 (Keiun 4): Deposits of copper was reported to have been found in Musashi Province in the region which includes modern day Tokyo.^[5]
708 (Keiun 5):, The era name was about to be changed to mark the accession of Empress Genmei; but the choice of Wadō as the new nengō for this new reign became a way to mark the welcome discovery of copper in the Chichibu District of what is now Saitama Prefecture.^[5] The Japanese word for copper is dō (銅); and since this was indigenous copper, the "wa" (the ancient Chinese term for Japan) could be combined with the "dō" (copper) to create a new composite term—"wadō"—meaning "Japanese copper."

Notes

^ Nussbaum, Louis-Frédéric. (2005). "Keiun" in Japan Encyclopedia, p. 506, p. 506, at Google Books; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File Archived 2012-05-24 at archive.today.
^ Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 60–63; Brown, Delmer et al. (1979). Gukanshō, pp. 270–271; Varley, H. Paul. (1980). Jinnō Shōtōki. pp. 137–140.
^ ^a ^b Brown, p. 271.
^ Varley, H. Paul. (1980). Jinnō Shōtōki, 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.
^ ^a ^b Titsingh, p. 63.