for those of you who are interested in the history of Karate at the time of the ryukyuan kingdom, here you can find a great lecture held by Charles Goodin and Pat Nakata.
Learn about the origins of Karate (Tudi, "Tang or China" Hand) among members of the highest levels of Ryukyuan society. Karate was part of the upbringing of selected sons of noble and samurai families who were trained to become bushi, cultured gentlemen. Based largely on Chinese martial arts and values, Karate was usually taught secretly or in private. After the Ryukyu Kingdom was abolished and Okinawa became a prefecture (1879), Karate became a part of the public school curriculum. Taught publicly and to a large number of students for the first time, Karate had to adapt to Japanese values and objectives.