Okita Sōji
During the Boshin War, after the Battle of Toba–Fushimi in the first month of the year Keiō-4, Okita went into Matsumoto Ryōjun's hospital in Edo. He then moved to a guesthouse with Okita Rintarou, Okita Mitsu, and their children. When the shogunate forces (including the Shinsengumi and the Shinchōgumi) retreated to the Tōhoku region, Okita remained in Edo alone. He died from tuberculosis on July 19 (the 30th day of the fifth month, by the lunar calendar), 1868. Later that night, he was buried at Senshō-ji Temple in Azabu, Edo, under his birth name (with Okita Sōji listed in the death records.) The claim that Okita died when he was 25 is based on the theory that he was born in 1844 and therefore was 25 by East Asian age reckoning when he died in 1868.