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Kenchō (建長) was aJapanese era name (年号,nengō; lit. "year name") afterHōji and beforeKōgen. This period spanned the years from March 1249 to October 1256.^[1] The reigning emperor wasGo-Fukakusa-tennō (後深草天皇).^[2]

• 1249Kenchō gannen (建長元年): The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced inHōji 3.

• 1253 (Kenchō 5):Kenchō-ji founded.^[3]

• 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 Odai 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 978-0-231-04940-5;OCLC 6042764

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

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