Ichirō Satō (佐藤 市郎, Satō Ichirō; August 28, 1889 – April 12, 1958) was a vice admiral in the Imperial Japanese Navy, educator, historian, and naval diplomat. As a member of the Satō–Kishi–Abe family, he was the older brother of two Japanese prime ministers, Nobusuke Kishi and Eisaku Satō.
Source: “Ichirō Satō”, English Wikipedia (CC BY-SA 4.0), excerpt