Takatsu Unki was born in Kumamoto Prefecture, 1842.
Took interest in national affairs at an early age and was a great advocate of the Emperor system and the expulsion of foreigners from Japan.
He eventually became a member of the Jimpilren, a band of Loyalists, and kept contact with Tomo-o Otaguro. When the Jimpilren rose in revolt against the Meiji Government (1876) he took a prominent role in the assassination of Major General Taneda. For his part in this killing he was executed the same year.