Xutang Zhiyu
Xutang Zhiyu 虚堂智愚 was a Chinese Chan-monk who gave dharma-transmission to Nanpo Shōmyō, the founder of the Japanese Rinzai Zen Ōtōkan-lineage. His style of koan practice was admired and emulated by Hakuin Ekaku, and today it's the only existing line of dharma-transmission in Japanese Rinzai Zen.
Writings
- The Record of Empty Hall, a collection of hundred koans with commentaries from Xutang Zhiyu