Sadatarō Hiraoka (Japanese: 平岡定太郎; 19 July 1863 – 26 August 1942)was the third Director of Karafuto Prefecture (11 June 1908 – 3 June 1914), and the 17th governor of Fukushima Prefecture (1906–1908). He was from Harima Province, and was a graduate of Tokyo Imperial University. Yukio Mishima was his grandchild.
Source: “Sadatarō Hiraoka”, English Wikipedia (CC BY-SA 4.0), excerpt