Sunpu Castle
In 1605, Ieyasu, acting as the , remained the effective ruler of Japan until his death. Ieyasu retired to Sunpu Castle in Sunpu, but he also supervised the building of Edo Castle, a massive construction project which lasted for the rest of Ieyasu's life. The result was the largest castle in all of Japan, the costs for building the castle being borne by all the other daimyo, while Ieyasu reaped all the benefits. The central donjon, or "tenshu", burned in the 1657 "Meireki" fire. Today, the Imperial Palace stands on the site of the castle.