1240s in Japan

Emperor of Japan

Emperor of Japan

Emperor of Japan

was a after Hōji and before Kōgen. This period spanned the years from March 1249 to October 1256. The reigning emperor was .

Japanese era from February 1247 to March 1249

was a after Ninji and before Hoji. This period spanned the years from February 1243 to February 1247. The reigning emperor was .

, also called Jinji, was a after ''En'ō and before Kangen.'' This period spanned the years from August 1240 to January 1243. The reigning emperors were and .

was a after Ryakunin and before Ninji. This period spanned the years from February 1239 to July 1240. The reigning emperor was .