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http://en.wikipedia.org/wiki/Emperor_Kokaku Emperor Kokaku (???? Kokaku Tenno) (September 23, 1771 – December 11, 1840) was the 119th imperial ruler of Japan, according to the traditional order of succession. He reigned from December 16, 1779 until May 7, 1817.
http://en.wikipedia.org/wiki/Go-Tsuchimikado Emperor Go-Tsuchimikado (?????? Gotsuchimikado Tenno) (July 3, 1442 – October 21, 1500) was the 103rd imperial ruler of Japan, according to the traditional order of succession. He ruled from August 21, 1464 until his death on October 21, 1500, giving him, at thirty-six years, 2 months, the longest reign of any emperor in the historical period prior to Emperor Meiji.
If Kokaku reigned 37 years 4 months (Dec 1779 - May 1817), how is Go-Tsuchimikado's 36 years 2 months "the longest"?