- Birth: ?
- Death: 1863
- Japanese:佐伯又三郎(Saeki Matasaburo)
It is unknown when he joined the Mibu Roshigumi. There is a record that he demonstrated Kenjutsu match in front of Lord Matsudaira Katamori. He killed Sasaki Aijiro but he was also assassinated later.
References
- Shinsengumi Taishi Den (新選組隊士伝) Gakken
- Shinsengumi Zentaishi Tettei Guide (新選組全隊士徹底ガイド) Maeda Masaki
- J-Wikipedia Hirayama Goro