Guishan Lingyou (溈山靈祐, गिरिश्री - Giriśrī; ཀུའེ་ཧྲན་ལིང་ཡོའུ། ku'e hran ling yo'u Kueshan Lingyou, universally revered across China, Japan, Korea, Vietnam, and East Asia as Dayuan Chanshi - 大圓禪師, Chan Master of the Great Circle, and in Japan as Isan Reiyū), acclaimed throughout East Asian Buddhist history as the illustrious 9th century Dharma heir of Baizhang Huaihai (749–814) and the co-founder—alongside his foremost disciple Yangshan Huiji (807–883)—of the Guiyang school (the earliest of the Five Houses of Chan Buddhism), stands as one of the wisest, most harmonious contemplative masters in the Chinese Tripitaka. With his year of birth in 771 and his year of death in 853, Guishan Lingyou was born into the Zhao family in Changxi (modern Xiapu) in Fujian province, China. Displaying serene spiritual maturity and acute awareness of anicca and dukkha from early youth, he practiced fearless renunciation at age fifteen, took formal refuge in the Buddha, the Dharma, and the Sangha, entered the monastic order at Jianshan Monastery under Fachang, and received full monastic ordination in the Dharmaguptaka Vinaya Pitaka lineage at Longxing Monastery in Hangzhou while upholding strict monastic precepts and ethical conduct.
After immersing himself in the study of the Vinaya Pitaka and both Mahayana and early Tripitaka scriptures in Hangzhou and on Mount Tiantai, Guishan Lingyou journeyed to Jiangxi province at age twenty-three to seek direct experiential awakening under Baizhang Huaihai on Mount Baizhang, where he served humbly as the monastery chief cook (dianzuo) alongside his senior Dharma brother Huangbo Xiyun (d. 850). One evening while sitting beside the kitchen hearth, Baizhang Huaihai asked Guishan Lingyou to poke the ashes to see if any fire remained; when Guishan Lingyou stirred the ashes and reported that there was none, Baizhang Huaihai reached deep into the hearth, uncovered a tiny glowing ember, and held it up asking if that was not fire—triggering an instantaneous, luminous breakthrough of non-dual awakening in Guishan Lingyou's mind-stream.
Shortly thereafter, a wandering geomancer named Sima Toutuo visited Mount Baizhang and informed Baizhang Huaihai that he had discovered a magnificent, wild mountain peak named Mount Dawei (Mount Gui) in Ningxiang (Hunan province) ideal for establishing a great monastic sanctuary of fifteen hundred practitioners, but requiring a master of extraordinary spiritual caliber. Testing both his senior monk Hualin Shanjue and Guishan Lingyou by placing a water pitcher before them and asking them to name it without calling it a pitcher, Baizhang Huaihai witnessed Guishan Lingyou step forward silently and kick the pitcher over with his foot, whereupon Baizhang Huaihai laughed joyfully and appointed Guishan Lingyou as founding abbot of Mount Dawei.
Ascending the wild, uninhabited slopes of Mount Dawei alone around 815–820, Guishan Lingyou lived for years among monkeys and wild beasts, subsisting on chestnuts and mountain herbs until local villagers and regional officials—including the devout Tang Prime Minister Pei Xiu (791–864)—discovered his radiant presence and built Tongqing Monastery (Miyin Monastery), which soon flourished into a renowned spiritual community housing over one thousand five hundred monastics. During the devastating Huichang Persecution of Buddhism (841–845) under Emperor Wuzong of Tang, Guishan Lingyou preserved the living lineage of Chan in seclusion before resuming his teaching seat under Emperor Xuanzong of Tang, training forty-three enlightened Dharma heirs led by Yangshan Huiji, Xiangyan Zhixian (d. 898), and Yangshan's fellow masters.
Literarily, Guishan Lingyou composed one of the most revered ethical and contemplative manuals in East Asian monasticism, the Guishan Jingce (溈山警策, Admonitions of Guishan, preserved in the Chinese Tripitaka and standard monastic daily recitations across China, Korea, Japan, and Vietnam), alongside his recorded dialogues in the Tanzhou Guishan Lingyou Chanshi Yulu (潭州溈山靈祐禪師語錄, Recorded Sayings of Chan Master Guishan Lingyou, Taisho Number 1989 in the Chinese Tripitaka) and the Jingde Chuandeng Lu (Taisho Number 2076). In his Admonitions of Guishan, Guishan Lingyou warned monastics with tender urgency against wasting their precious human rebirth in idle chatter and luxury, urging relentless right effort to repay the kindness of parents, patrons, and the Three Jewels.
Philosophically and contemplatively, Guishan Lingyou and Yangshan Huiji pioneered the subtle, non-verbal pedagogy of the Guiyang school—utilizing silent gestures, symbolic circles drawn in the air or on the ground (yuangxiang, 圓相), and intuitive mirroring between master and disciple to express the harmonious unity of principle (li) and phenomena (shi). Harmonizing this refined immediacy with Nagarjuna's Madhyamaka dialectics regarding emptiness (शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid) and dependent origination, Asanga's Yogacara phenomenology, and the innate Buddha-nature (tathagatagarbha) teachings of the Mahaparinirvana Sutra (Taisho Number 374 and Toh Number 119 in the Tibetan Tripitaka) and Maitreya's Uttaratantra Shastra (Toh Number 4024 and Taisho Number 1611), Guishan Lingyou guided disciples through single-pointed meditation, mindfulness, and concentration to dissolve clinging to the five aggregates, anatta, emptiness of self, karma, and rebirth across samsara and nirvana.
Throughout his four decades on Mount Dawei—most famously in his patient, compassionate mentorship of Xiangyan Zhixian, whom he gently refused to give intellectual explanations so that Xiangyan Zhixian might experience direct awakening upon hearing a pebble strike bamboo—Guishan Lingyou wielded subtle skillful means while anchoring monastic life in Shakyamuni Buddha's foundational teachings on the Four Noble Truths, the Noble Eightfold Path, generosity, merit, loving-kindness, compassion, equanimity, right view, non-attachment, and universal bodhicitta to uproot the three poisons of greed, hatred, and delusion across the six realms.
Passing into final parinirvana at Tongqing Monastery on Mount Dawei in 853 at the age of eighty-two after washing his face, rinsing his mouth, and smiling serenely while reclining peacefully—yielding luminous relics enshrined in his memorial stupa on Mount Dawei—Guishan Lingyou was posthumously honored by Emperor Xuanzong of Tang with the imperial title Dayuan Chanshi (Chan Master of the Great Circle). Carried forward through Yangshan Huiji across China, Korea (where Silla disciples transmitted the Guiyang lineage), and Japan (as the Igyō school), Guishan Lingyou stands forever alongside Bodhidharma, Huineng, Mazu Daoyi, Baizhang Huaihai, and Nagarjuna as a supreme guardian of the Middle Way.