Toshima

Toshima was a district of Musashi that included part of the growing city of Edo. Ōta Dōkan established a castle there in the fifteenth century; after Tokugawa Ieyasu entered the Kantō in 1590, he made Edo his seat and developed the surrounding town. As the shogun's capital expanded, roads converged at Nihonbashi and new waterworks supplied its inhabitants. Edo's growth transformed the fields and settlements of the old district.