Some of these barriers were those already existing before the establishment of the shogunate, but most were built during the reign of Shogun [[Tokugawa Hidetada]] (r. [[1605]]-[[1623]]), with the last of the 53 ''sekisho'' being established in [[1686]]. Many were newly constructed where no formal barrier checkpoint had existed before, but some were built as expansions or reconfigurations of barriers built by local/regional warlords. | Some of these barriers were those already existing before the establishment of the shogunate, but most were built during the reign of Shogun [[Tokugawa Hidetada]] (r. [[1605]]-[[1623]]), with the last of the 53 ''sekisho'' being established in [[1686]]. Many were newly constructed where no formal barrier checkpoint had existed before, but some were built as expansions or reconfigurations of barriers built by local/regional warlords. |