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How did the destruction of the Toyotomi family strengthen Tokugawa rule?

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Statue of Tokugawa Ieyasu in ornate robes holding a bow, with arrows on his back, at the Tosho-gu shrine in Nikko, Japan. — Tokugawa Ieyasu Statue of Tokugawa Ieyasu at the Tōshō Shrine in Nikkō, Japan.

The destruction of the Toyotomi family was a critical step in securing Tokugawa Ieyasu’s political legitimacy and establishing his family as the preeminent power in Japan. Although Ieyasu had become the dominant military leader following the Battle of Sekigahara, the survival of Toyotomi Hideyori—the son and heir of the great unifier Toyotomi Hideyoshi—remained a significant threat to Tokugawa authority.12

Many feudal lords remained loyal to the memory of Hideyoshi, and Hideyori’s presence at Osaka Castle served as a rallying point for potential opposition. Ieyasu initially tolerated Hideyori to mollify these loyalists, but he eventually moved to eliminate this last rival in 1614, using a pretext regarding an inscription on a temple bell.12

Following two military campaigns, Ieyasu reduced the castle and forced the destruction of its defenses. The subsequent death of Hideyori and his family removed the final obstacle to Tokugawa rule, allowing Ieyasu to transition his military might into undisputed political authority and ensure the enduring preeminence of the Tokugawa shogunate.12