Tokugawa Ieyasu's entrance to Edo Castle was a significant milestone in the formation of a centralized feudal government in Japan. This moment followed the decisive Siege of Odawara in 1590, where Ieyasu successfully defeated the Hojo clan, eliminating a major rival and establishing himself as the leading daimyo. Ieyasu's victory was not only a tactical win but also a symbolic message that he was a formidable leader capable of uniting Japan under his rule. Upon entering Edo Castle, he set into motion plans to improve and develop the village of Edo, which would eventually become the bustling city of Tokyo.

Ieyasu's choice of Edo as the seat of his government was based on its strategic location and favorable geography. The castle served as his base of operations, allowing him to administer and control other regions effectively. Under his leadership, Edo transformed from a small fishing village into a political center. Ieyasu implemented various policies that fostered economic growth, infrastructure development, and cultural advancements during the Edo period, which lasted from 1603 to 1868. This era was characterized by peace, stability, and isolationist policies that shaped Japanese society.

Ieyasu's foundation of the Tokugawa shogunate laid the groundwork for a centralized government that would endure for generations. His vision for a unified Japan materialized as he crafted a new societal order, including the samurai class's roles and responsibilities. The legacy of his leadership continued long after his death, influencing Japanese culture, politics, and society significantly. In many ways, entering Edo Castle was not just about claiming power; it was about redefining the very fabric of Japanese life.