Yunmen Wenyan, a renowned Tang Dynasty Zen Buddhist monk, lived from 862 to 949. He is considered the founder of the Yunmen School of Zen and holds a significant position in the history of Zen Buddhism. Wenyan emphasized the Zen concept of 'not establishing words, transmission outside the teachings,' advocating for direct pointing to the mind and realization of Buddha-nature. His teachings and Zen ideas have had a profound impact on later generations.