Ishii Yujiro

• Birth: 1846/1/31
• Death: 1903/6/17
• Original name: Ishii Sadayuki (石井貞行)
• Other name: Genjirô (源次郎)
• Japanese: 石井　勇次郎　(Ishii Yuujirou)

Ishii Yujiro was from Kuwana han in Ise province, and was the oldest son of Ishii Fumiya. He was a student of Jiki Shin-Kage Ryu. He joined the Shinsengumi in 1868 during the Boshin War. After the Battle of Hakodate, he was sent to Kuwana han and released in a year. He became a Mie prefecture staff.

References

• Shinsengumi - Honor and Determination of the Mibu Rôshi (血誠新撰組-峻烈壬生浪士忠と斬), Rekishi Gunzô series #31, Gakken, Japan, 2003
• Shinsengumi Zentaishi Tettei Guide (新選組全隊士徹底ガイド) Maeda Masaki