The Gateless Barrier (Mandarin: 無門關 "Wúménguān"; Japanese: 無門関 "Mumonkan"), sometimes translated as The Gateless Gate, is a collection of 48 Chan (Zen) koans compiled in the early 13th century by the Chinese Zen master Wumen Huikai (無門慧開; Japanese: "Mumon Ekai"; 1183–1260).