Prince It Hirobumi was a Japanese statesman and genr. A Londoneducated samurai of the Chsh Domain and an influential figure in the early Meiji Restoration government, he chaired the bureau which drafted the Meiji Constitution in the 1880s. Looking to the West for legal inspiration, It rejected the United States Constitution as too liberal and the Spanish Restoration as too despotic before ultimately drawing on the British and German models, especially the Prussian Constitution of 1850. Dissatisfied with the prominent role of Christianity in European legal traditions, he substituted references to the more traditionally Japanese concept of kokutai or national polity, which became the constitutional justification for imperial authority.
It was born as Hayashi Risuke. His father Hayashi Jz was the adopted son of Mizui Buhei who was an adopted son of It Yaemons family, a lowerranked samurai from Hagi in Chsh Domain . Mizui Buhei was renamed It Naoemon. Mizui Jz took the name It Jz, and Hayashi Risuke was renamed to It Shunsuke at first, then It Hirobumi. He was a student of Yoshida Shin at the Shka Sonjuku and later joined the Sonn ji movement , together with Kido Takayoshi. It was chosen as one of the Chsh Five who studied at University College London in 1863, and the experience in Great Britain convinced him Japan needed to adopt Western ways.
Source: Wikipedia