waird wis established on 15 Mairch 1947 wi the merger o the umwhile wairds o Yotsuya, Ushigome, an Yodobashi. It servit as pairt o the athletics 50 km walk an marathon course durin the 1964 Simmer Olympics . [7] In 1991, the Tokyo Metropolitan Govrenment muivit frae the Marunouchi destrict o Chiyoda