Baron Ijichi Kōsuke (伊地知 幸介, Kōsuke Ijichi; December 25, 1854 – January 23, 1917) was a general in the Imperial Japanese Army in the First Sino-Japanese War and Chief of Staff of the Japanese Third Army during the Siege of Port Arthur in the Russo-Japanese War. His wife was the niece of Marshal Oyama Iwao.
Source: “Ijichi Kōsuke”, English Wikipedia (CC BY-SA 4.0), excerpt