Who was the buddhist figure who forbade writing what he said, and whose disciples instead wore paper robes?
Yúnmén Wényǎn (862 or 864 – 949 CE), (雲門文偃; Japanese: うんもんぶんえん, Ummon Bun'en; also known in English as "Unmon", "Ummon Daishi", "Ummon Zenji"), was a major[a] Chinese Zen master in Tang-era China. He was a dharma-heir of Xuefeng Yicun