Four Hitokiri of the Bakumatsu

The Four Hitokiri of the Bakumatsu (幕末四大人斬り, Bakumatsu Yondai Hitokiri) was a term given to four samurai during the Bakumatsu era in Japanese history. The four men were Kawakami Gensai, Kirino Toshiaki (also known as Nakamura Hanjirō), Tanaka Shinbei, and Okada Izō.

Source: Wikipedia — Four Hitokiri of the Bakumatsu (CC BY-SA 4.0)