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Yamagata Aritomo Gensui Prince Yamagata Aritomo also known as Prince Yamagata Kyōsuke, was a Japanese statesman and military commander who was twice-elected Prime Minister of Japan, and a leading member of the genrō, an élite group of senior statesmen who dominated Japanese politics after the Meiji Restoration. As the Imperial Japanese Army's inaugural Chief of Staff, he was the chief architect of the Empire of Japan's military and its reactionary ideology. For this reason, some historians consider Yamagata to be the “father” of Japanese militarism. During the latter part of the Meiji Era, Yamagata vied against Marquess Itō Hirobumi for control over the nation's policies. After Itō was assassinated in 1909, he emerged as the most powerful figure among Japan's genrō. Henceforth, Yamagata remained the nation's preeminent statesman until a political crisis arising from his meddling in Crown Prince Hirohito's engagement resulted in him losing power shortly before his death in February 1922.