In the Bunmei Era of the late Muromachi period, some examples appeared that the northern side of Toba was called 'Kamitoba' ('Umaryo denchi baiken' [a farmer's note for selling land of the horse office of the Right] in "To-ji Hyakugo Monjo" [100 case documents, of the To-ji Temple]) and the southern side 'Shimotoba' (in "Saneto Koki" [the record of Lord Saneto]).
室町時代後期の文明年間に入ると、鳥羽の北側を「上鳥羽」（『東寺百合文書』所収「右馬寮田地売券」）、南側を「下鳥羽」（『実遠公記』）と呼ぶ例が現れる。