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Ryakunin (暦仁) was a Japanese era name (年号, nengō, lit. "year name") after Katei and before En'ō. This period spanned the years from November 1238 to April 1239.^[1] The reigning emperor was Shijō-tennō (四条天皇).^[2]

• 1238 Ryakunin gannen (暦仁元年): The era name was changed to mark an event or a number of events. The previous era ended and a new one commenced in Katei 4.

• 1238 (Ryakunin 1, 1st month): Yoritsune leaves Kamakura en route to Miyako, accompanied by Yaskutoki and the troupes of several provinces. Fujiwara no Yukimitis stays at Kamakura to preserve order in the land.^[3]
• 1238 (Ryakunin 1, 2nd month): Yoritsune arrives in Miyako and begins to live in his new palace at Rokuhara.^[4]
• 1238 (Ryakunin 1, 10th month): Yoritsune leaves Miyako to return to Kamakura.^[4]

• 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