Yasutsune (Ank?) Itosu is considered by many the father of modern karate, although this title is also often given to Gichin Funakoshi because the latter spread karate throughout Japan.
Itosu was born in 1831 and died in 1915. Itosu was small in stature, shy, and introverted as a child. He was raised in a strict home of the keimochi (a family of position), and was educated in the Chinese classics and calligraphy. Itosu began his tode (karate) study under Nagahama Chikudon Peichin. His study of the art led him to Sokon Matsumura. Part of Itosu's training was makiwara practice. He once tied a leather sandal to a stone wall in an effort to build a better makiwara. After several strikes, the stone fell from the wall. After relocating the sandal several times, Itosu had destroyed the wall.
Itosu served as a secretary to the last king of the Ryukyu Islands until Japan abolished the Okinawa-based native monarchy in 1879. In 1901, he was instrumental in getting karate introduced into Okinawa's schools. In 1905, Itosu was a part-time teacher of To-te at Okinawa's First Junior Prefectural High School. It was here that he developed the systematic method of teaching karate techniques that are still in practice today. He created and introduced the Pinan forms (Heian in Japanese) as learning steps for students, because he felt the other forms (kata in Japanese, hyung in Korean) were too difficult for schoolchildren to learn. The five Pinan forms were created by drawing from two older forms: kusanku and chiang nan. Itosu is also credited with taking the large Naihanchi form (tekki in Japan) and breaking it into the three well-known modern forms Naihanchi Shodan, Naihanchi Nidan, and Naihanchi Sandan. In 1908, Itosu wrote the influential "Ten Precepts (Tode Jukun) of Karate," reaching beyond Okinawa to Japan. Itosu's style of karate came to be known as Itosu-ryu in recognition of his skill, mastery, and role as teacher to many.
While Itosu did not invent karate himself, he codified the kata (forms) learned from his master, Matsumura, and taught many karate masters. Itosu's students included Choyu Motobu (1857–1927), Choki Motobu (1870–1944), Kentsu Yabu (1866–1937), Chomo Hanashiro (1869–1945), Gichin Funakoshi (1868–1957), Moden Yabiku (1880–1941), Kanken Toyama (1888–1966), Chotoku Kyan (1870–1945), Shinpan Shiroma (Gusukuma) (1890–1954), Anbun Tokuda (1886–1945), Kenwa Mabuni (1887–1952), and Choshin Chibana (1885–1969).
In October 1908, Itosu wrote a letter, "Ten Precepts (Tode Jukun) of Karate," to draw the attention of the Ministry of Education and the Ministry of War in Japan. A translation of that letter reads:
Karate did not develop from Buddhism or Confucianism. In the past the Shorin-ryu school and the Shorei-ryu school were brought to Okinawa from China. Both of these schools have strong points, which I will now mention before there are too many changes:
This letter was influential in the spread of karate.