was a famous swordsman of Japan during the 17th century. Dannoshin served as a guard of the Edo Palace. Dannoshin considered killing people on the ground of the palace to be rather sacrilegious. Due to this belief, Dannoshin tried to find a more peaceful way to apprehend intruders. After some time, Dannoshin produced a two-foot-long chain with two weights, one attached to each end, and devised a series of techniques to disarm and subdue an armed opponent. Dannoshin's unique weapon soon became known as the manriki-gusari, in which manriki means "10,000 power", and gusari means "chain". This was because Dannoshin believed that the weapon contained the power and the ingenuity of 10,000 people. This weapon fighting style soon evolved into the Masaki-ryu style.