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He spent the last four years of his life there engaged in practice of Zazen (meditation), painting, and joining tea ceremonies and poetry gatherings with the domain’s elite. Many of Musashi’s famous ink paintings were created during this period of intense personal reflection. By this time, Japan had become politically stable and war was now a distant memory. Musashi, being among the last generations who had personally experienced conflict, sensed that samurai were losing their sense of identity. He resolved to make a pilgrimage to Reigandō Cave43 in 1643 and started writing Gorin-no-sho there, hoping to preserve for posterity his Way, and what he believed to be the very essence of warriorship. A year later he fell ill, and the domain elders encouraged him to return to Kumamoto to be cared for. He continued working on his treatise for five or six months. On the twelfth day of the fifth month of 1645, he passed the not quite finished manuscript to his student Magonojō. He gave away all his worldly possessions, and then wrote Dokkōdō, a brief list of twenty-one precepts that summed up his principles shaped over a lifetime of austere training. He died on the nineteenth day of the fifth month of 1645. It is said that he had taken ill with “dysphagia,” which suggests perhaps that he had terminal stomach cancer. Some say he died of lung cancer. In Bukōden, it is recorded that Musashi was laid in his coffin dressed in full armor and with all his weapons. It evokes a powerful image of a man who had dedicated his whole life to understanding the mind of combat and strategy. As testament once again to the conspiracy theories surrounding Musashi’s life, I am reminded of a bizarre book titled Was Musashi Murdered and Other Questions of Japanese History by Fudo Yamato (Zensho Communications, 1987). In it the author postulates that Musashi’s death was actually assassination through poisoning. The author argues that Musashi and many of his contemporaries such as the priest Takuan, Hosokawa Tadaoki (Tadatoshi’s father) who was suspected of “Christian sympathies,” and even Yagyū Munenori were all viewed with suspicion by the shogunate. He goes so far as to hypothesize that the phrase found at the end of Musashi’s Combat Strategy in 35 Articles “Should there be any entries you are unsure of, please allow me to explain in person…” was actually interpreted by the government as a call for those with anti-shogunate sentiments to gather in order to hatch a seditious plot (p. 20). This is why, Fudo Yamato argues, Musashi and these other notable men of his age all died mysteriously at around the same time.
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Alexander Bennett (Complete Musashi: The Book of Five Rings and Other Works: The Definitive Translations of the Complete Writings of Miyamoto Musashi--Japan's Greatest Samurai)