Shotokan Karate Gichin Funakoshi, founder of Shotokan karate, is generally credited with having introduced and popularized karate on the main islands of Japan. In addition many Okinawans were actively teaching, and are thus also responsible for the development of karate on the main islands. Funakoshi was a student of both Asato Ank? and Itosu Ank? (who had worked to introduce karate to the Okinawa Prefectural School System in 1902). During this time period, prominent teachers who also influenced the spread of karate in Japan included Kenwa Mabuni, Ch?jun Miyagi, Motobu Ch?ki, Kanken T?yama, and Kanbun Uechi. This was a turbulent period in the history of the region. It includes Japan's annexation of the Okinawan island group in 1872, the First Sino-Japanese War (1894–1895), the Russo-Japanese War (1904–1905), the annexation of Korea, and the rise of Japanese militarism (1905–1945). Japan was invading China at the time, and Funakoshi knew that the art of Tang/China hand would not be accepted; thus the change of the art's name to "way of the empty hand." The d? suffix implies that karated? is a path to self-knowledge, not just a study of the technical aspects of fighting. Like most martial arts practiced in Japan, karate made its transition from -jutsu to -d? around the beginning of the 20th century. The "d?" in "karate-d?" sets it apart from karate-jutsu, as aikido is distinguished from aikijutsu, judo from jujutsu, kendo from kenjutsu and iaido from iaijutsu. Gichin Funakoshi, founder of Shotokan Karate Funakoshi changed the names of many kata and the name of the art itself (at least on mainland Japan), doing so to get karate accepted by the Japanese bud? organization Dai Nippon Butoku Kai. Funakoshi also gave Japanese names to many of the kata. The five pinan forms became known as heian, the three naihanchi forms became known as tekki, seisan as hangetsu, Chint? as gankaku, wanshu as enpi, and so on. These were mostly political changes, rather than changes to the content of the forms, although Funakoshi did introduce some such changes. Funakoshi had trained in two of the popular branches of Okinawan karate of the time, Shorin-ry? and Sh?rei-ry?. In Japan he was influenced by kendo, incorporating some ideas about distancing and timing into his style. He always referred to what he taught as simply karate, but in 1936 he built a dojo in Tokyo and the style he left behind is usually called Shotokan after this dojo. The modernization and systemization of karate in Japan also included the adoption of the white uniform that consisted of the kimono and the dogi or keikogi—mostly called just karategi—and colored belt ranks. Both of these innovations were originated and popularized by Jigoro Kano, the founder of judo and one of the men Funakoshi consulted in his efforts to modernize karate. A new form of karate called Kyokushin was formally founded in 1957 by Masutatsu Oyama (who was born a Korean, Choi Yeong-Eui ???). Kyokushin is largely a synthesis of Shotokan and G?j?-ry?. It teaches a curriculum that emphasizes aliveness, physical toughness, and full contact sparring. Because of its emphasis on physical, full-force sparring, Kyokushin is now often called "full contact karate", or "Knockdown karate" (after the name for its competition rules). Many other karate organizations and styles are descended from the Kyokushin curriculum.