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Ten'en (天延) was a Japanese era (年号, nengō, "year name") after Tenroku and before Jōgen. This period spanned the years from December 973 through July 976.^[1] The reigning emperor was En'yū-tennō (円融天皇).^[2]

• February 6, 973 Ten'en gannen (天延元年): The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced in Tenroku 4, on the 20th day of the 12th month of 973.^[3]

• May 28, 973 (Ten'en 1, 24th day of the 4th month): A fire broke out in a Minamoto compound located near the Imperial Palace. The fire could not be contained; and more than 300 houses were reduced to cinders. The guard was doubled around the Emperor's residence.^[4]
• 974 (Ten'en 2, 2nd month): Fujiwara no Kanemichi was named Daijō-daijin; and he was given permission to travel to court in a carriage.^[4]
• 974 (Ten'en 2, 10th month): The emperor received a gift of horses from Korea.^[4]
• 975 (Ten'en 3, 8th month): A comet was seen in the night sky.^[4]

• 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

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