Could Yamamoto Kansuke have been Shingen's chief advisor? Focus on the one-eyed military strategist whose existence was doubted

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Could Yamamoto Kansuke have been Shingen's chief advisor? Focus on the one-eyed military strategist whose existence was doubted

Yamamoto Kansuke was known as the one-eyed military strategist of the Takeda clan of Kai during the Sengoku period, and even played the lead role in the 2007 Taiga drama "Fuurin Kazan." In fact, for a long time it was believed that he "was not a real person." Not only could he not be definitively confirmed from historical sources, but his exploits as depicted in "Kōyō Gunkan" were so perfect that he was thought to be fiction. However, thanks to …