Shō Shin
In 1429, the three kingdoms on Okinawa unified to form the Kingdom of Ryukyu. When King Shō Shin came into power in 1477, he banned the practice of martial arts. Tō-te and Ryukyu kobudō (weaponry) continued to be taught in secret. The ban was continued in 1609 after Okinawa was invaded by the Satsuma Domain of Japan. The bans contributed to the development of kobudō which uses common household and farming implements as weaponry.