Engi (era)
Engi (延喜) was a Japanese era name (年号, nengō) after Shōtai and before Enchō. This period spanned the years from July 901 through April 923. The reigning emperor was Daigo-tennō (醍醐天皇).
Engi (延喜) was a Japanese era name (年号, nengō) after Shōtai and before Enchō.  This period spanned the years from July 901 through April 923. The reigning emperor was Daigo-tennō (醍醐天皇).

Change of era
January 23, 901 Engi gannen (延喜元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Shōtai 4, on the 15th day of the 7th month of 901.

Events of the Engi era
February 1, 901 (Engi 1, 1st day of the 1st month): There was an eclipse of the Sun.
901 (Engi 1): The Sugawara no Michizane "incident" developed; but more details cannot be known, because Daigo ordered that diaries and records from this period should be burned.
May 905 (Engi 5, 4th month): Ki no Tsurayuki presented the emperor with the compilation of the Kokin Wakashū, a collection of waka poetry.
909 (Engi 9, 4th month):  The sadaijin Fujiwara no Tokihira died at the age of 39. He was honored with the posthumous title of regent.

Notes
References
Brown, Delmer M. and Ichirō Ishida, eds. (1979). Gukanshō: The Future and the Past. Berkeley: University of California Press. ISBN 978-0-520-03460-0; OCLC 251325323
Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 58053128
Titsingh, Isaac. (1834). Nihon Ōdai Ichiran; ou, Annales des empereurs du Japon.  Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland. OCLC 5850691
Varley, H. Paul. (1980). A Chronicle of Gods and Sovereigns: Jinnō Shōtōki of Kitabatake Chikafusa. New York: Columbia University Press. ISBN 9780231049405; OCLC 6042764

External links
National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection