A Chōshū samurai and statesman of the Bakumatsu and Meiji periods, known by his common name Katsura Kogorō and renamed Kido Takayoshi after the Restoration. He studied at Yoshida Shōin's Shōka Sonjuku and became a central figure in the anti-shogunate movement. During the 1864 Kinmon Incident (Hamaguri Gomon no Hen), when Chōshū was declared an enemy of the court, he was placed on a wanted list nationwide but narrowly escaped, earning the nickname "Fleeing Kogorō." In 1866, with Sakamoto Ryōma mediating, he concluded the Satchō Alliance with Satsuma's Saigō Takamori, decisively charting the path to overthrowing the shogunate. In the Meiji government he participated in drafting the Charter Oath and promoted major policies including abolition of the domains and the Education Act (universal schooling). He was opposed to Itagaki Taisuke's petition for an elected assembly, causing internal government conflict. He died of illness during the Satsuma Rebellion in 1877. Together with Ōkubo and Saigō, he is called one of the "Three Great Heroes of the Meiji Restoration."

A statesman of calm analytical power and tenacious diplomatic skill. He prioritized logic over emotion and acted with long-range vision. The nickname "Fleeing Kogorō" arose not from cowardice but from strategic judgments that kept the larger picture in view. He maintained consistent principles through the turbulent changes of his age.

The Satchō Alliance was one of the most pivotal steps toward the Meiji Restoration. Policies he led—the Charter Oath, abolition of domains, and the Education Act—formed the skeleton of modern Japan. Shōin Shrine and the Shōka Sonjuku in Hagi, Yamaguchi, preserve the legacy of his teacher Yoshida Shōin and the Chōshū activists.