H. Irving Hancock is responsible to series of earliest jiu-jitsu books before 1910 that maybe are still the most printed ones. These books have been translated to at least; French, Finnish, German, Italian, Polish, Portuguese, Swedish. he knew the markets and advertized one of his books with the fame of Judo "The Complete Kano Jiu-Jitsu - Jiudo - The Official Jiu-Jitsu Of The Japanese Government - With Additions By Hoshino And Tsutsumi And Chapters On The Serious And Fatal Blows And On Kuatsu The Japanese Science Of The Restoration Of Life" He also acted as promotor of several japanese jiu-jitsu wrestrels and arranged professional fights for them. One of these is Katsukuma Higashi.
http://ejmas.com/jcs/jcsart_edgren1_0300.htm
In his book "Japanese physical training : the system of exercise, diet, and general mode of living that has made the Mikado's people the healthiest, strongest, and happiest men and women in the world" By Hancock, Harrie Irving (1868 - 1922), New York, United States, G. P. Putnam's Sons, 1903 1904[2] 1905[8], 156p he states of himself "Something more than seven years ago he (I) began his course of instruction in jiu-jitsu under Japanese friends in this country. Subsequently he studied in Nagasaki,, under Inoye San, instructor of jiu-jitsu in the police department of that city. Still later the author took supplementary courses under native teachers in Yokohama and Tokio. When Inoye San visited this country the author went once more under the tuition of that veteran who is considered to be one of the best instructors in Japan."
We have also Risher W. Thornberry who wrote several books and was one of the jiu-jitsu (combat) instructors of Americans during WWI.
http://ejmas.com/jnc/jncart_henderson_0600.htm
One of his jiu-jitsu books was "Jiu-Jitsu As Taught by Kishoku Inouye" By Thornberry, Risher W., Yokohama, Japan, Box of Curios Printing & Publishing Co., 1905. Thornberry wrote several books on jujitsu from 1905 to 1933.
The book alledgedly shows a picture of Prof. Kishoku Inouye, "Instructor to the Nagasaki Police".
But what do we know of Inoye Kishoku?