Emperor Chūkyō

Emperor Chūkyō (仲恭天皇, Chūkyō-tennō) (30 October 1218 – 18 June 1234) was the 85th emperor of Japan, according to the traditional order of succession. His reign spanned only two months in 1221, and he was not officially listed amongst the emperors until 1870 because of doubts caused by the length of his reign. The Imperial Household Agency recognizes Kujō no misasagi (九條陵) near Tōfuku-ji in Fushimi-ku, Kyoto as his tomb.

Source: Wikipedia — https://en.wikipedia.org/wiki/Emperor_Ch%C5%ABky%C5%8D