Battle of Sekigahara / 关原合战

The Battle of Sekigahara / 关原合战 is the power-transition battle that frames William Adams / 三浦按针’s arrival in 14.武士威廉：大航海时代的日本和西方. The episode says Adams reaches Japan in 1600, just before Tokugawa Ieyasu fights the coalition supporting Toyotomi succession.

The source mentions a possible story that European cannon from Adams’s damaged ship may have helped Ieyasu, but it explicitly treats this as uncertain. The battle matters more securely as timing: Adams arrives when Ieyasu is about to become the dominant ruler, which makes access to the Tokugawa center historically consequential.

Key Claims

• Sekigahara makes Adams’s arrival politically meaningful because he reaches Japan at a regime-formation moment.
• Konishi Yukinaga’s defeat, execution, and later European reception show that the battle also entered Christian and European imagination.
• The source avoids making the cannon story a firm causal claim.

Connections

• Tokugawa Ieyasu - winner and later Adams patron.
• Tokugawa Shogunate / 德川幕府 - regime order emerging from the battle.
• William Adams / 三浦按针 - foreign arrival near the battle.
• Konishi Yukinaga - Christian daimyo on the losing side.
• Early Modern Japan-Europe Contact - battle’s afterlife in European stories and letters.