It was also called "Higashi no Chu-mon" (lit. eastern inner gate) and "Sakonfu no Jin" (lit. Post of the Inner Palace Guards) because it was assigned to serve as a post for the Konoefu (Inner Palace Guards).
東の中門ともいい、近衛府の陣に充てられたため、左近陣（さこんのじん）ともいう。