The Shinsengumi was a special police force formed in Japan during the late Edo period, specifically in 1863. Comprised mainly of masterless samurai, known as ronin, the group aimed to protect the Tokugawa shogunate and maintain order in Kyoto. They became known for their strict code of conduct and distinctive uniforms, which included a dark blue haori. The Shinsengumi played a significant role during the turbulent times leading up to the Meiji Restoration. They were involved in various conflicts, including the Boshin War, and became famous for their fierce loyalty and combat skills. Their legacy continues to be celebrated in Japanese culture through literature, film, and television.