Out of above gates, Joto-mon Gate and Josai-mon Gate were called 'Tsuchi no mon' (the gate made out of mud), 'Tsuchimikado,' since they had a tile-roofed mud wall without having proper roof to use as service entrance for Okura. (the Ministry of finance)
このうち上東門と上西門は大蔵通用門として「屋根を設けず築地を開いただけ」の門であったため、「土の門」＝「土御門」と呼ばれた。