chokushimon 勅使門

A gate originally used only by the Emperor. Primarily found at Buddhist temples, it is usually a four-legged gate *shikyakumon 四脚門. Some have undulating gables *karahafu 唐破風, and many are roofed with cypress bark *hiwadabuki 桧皮葺. 

Example: Nanzenji Chokushimon 南禅寺勅使門. Its marker says it was the old Hi-no-gomon 日の御門 from Kyoto Gosho 京都御所 in the late 16th century to early 17th century and that in 1642 it was presented to the temple Nanzenji as an imperial envoy's gate. Kenninji 建仁寺 Chokushimon (14th century) is a four-legged gate and is also called ya-no-ne mon 矢の根門 (arrow tip gate).