Fazang (法藏, धर्मगुप्त - Dharmagupta / धर्मकोश - Dharmakośa; ཕ་ཙང་། pha tsang Patsang, universally revered across China, Korea, and Japan as Xianshou Dashi - 賢首大師, Great Master Xianshou), acclaimed throughout East Asian Buddhist history as the supreme philosophical systematizer and Third Patriarch of the Huayan (Avatamsaka) school and the illustrious Chinese Dharma brother of the Korean master Uisang (625–702), stands as one of the greatest metaphysicians, translators, and imperial preceptors of the 7th century and 8th century. With his year of birth in 643 and his year of death in 712, Fazang was born into a prominent family of Sogdian ancestry in the Tang imperial capital of Chang'an (modern Xi'an) in Shaanxi province, China, to his father, Kang Mi, and his mother, Lady Qu. Displaying extraordinary intellectual brilliance and spiritual devotion from early youth, he practiced fearless renunciation at age sixteen—famously burning off a finger as a devotional offering at the stupa of Famen Temple housing a relic of Shakyamuni Buddha—took formal refuge in the Buddha, the Dharma, and the Sangha, and immersed himself in the study of the Avatamsaka Sutra (華嚴經, Taisho Number 278 in the Chinese Tripitaka and Toh Number 44 in the Tibetan Tripitaka) on Mount Taibai.
Around 661–662, Fazang met his supreme root guru, the Second Patriarch of the Huayan tradition, Zhiyan (602–668), at Yunhua Monastery near Chang'an, becoming Zhiyan's foremost disciple alongside his lifelong Korean Dharma companion Uisang. Recognizing Fazang's unparalleled analytical genius and spiritual maturity, Zhiyan conferred upon him the complete oral transmissions and doctrinal insights of the Avatamsaka Sutra before passing into parinirvana in 668. Two years later, in 670, Fazang received full monastic ordination in the Dharmaguptaka Vinaya Pitaka lineage at Taiyuan Monastery—founded by Empress Wu Zetian in memory of her mother—upholding strict adherence to monastic precepts and ethical conduct while rising rapidly to become the foremost Buddhist preceptor at the Tang imperial court.
Over the next four decades, Fazang enjoyed extraordinary imperial patronage under Empress Wu Zetian and Emperors Zhongzong of Tang and Ruizong of Tang, who bestowed upon him the honorific title Xianshou (Leading Worthy) and invited him repeatedly to expound the Avatamsaka Sutra in the imperial palaces of Luoyang and Chang'an. Alongside his teaching duties, Fazang played a pivotal role as chief translation verifier and editor in the monumental translation projects of visiting Indian and Central Asian masters—most notably collaborating with the Khotanese master Shikshananda (652–710) between 695 and 699 to produce the authoritative eighty-fascicle translation of the Avatamsaka Sutra (Taisho Number 279), as well as assisting Divakara, Devaprajna, Bodhiruci, and Yijing (635–713) in rendering foundational Sanskrit sutras and shastras into the Chinese Tripitaka.
Literarily, Fazang composed an extraordinary corpus of over one hundred fascicles preserved in the Chinese Tripitaka that permanently defined East Asian Huayan philosophy and exercised a profound influence on Korean Hwaeom and Japanese Kegon Buddhism. Among his supreme doctrinal masterpieces are the Huayan Wujiao Zhang (華嚴五教章, Treatise on the Five Teachings of Huayan, Taisho Number 1866), which established the famous fivefold classification of all Buddhist teachings (panjiao); the twenty-fascicle Huayan Jing Tanxuan Ji (華嚴經探玄記, Record of Searching into the Profundities of the Avatamsaka Sutra, Taisho Number 1733); the celebrated Jin Shizi Zhang (金師子章, Treatise on the Golden Lion, Taisho Number 1880), delivered to Empress Wu Zetian using a palace golden lion statue to illustrate the relationship between principle (li) and phenomena (shi); and the Dasheng Qixin Lun Yiji (大乘起信論義記, Taisho Number 1846), his masterly commentary on Ashvaghosha's Awakening of Faith in the Mahayana (Taisho Number 1666).
Philosophically, Fazang systematized the towering Huayan metaphysics of the Dharma-Realm of Dependent Origination (Fajie Yuanqi) and the Fourfold Dharma-Realm (Si Fajie), culminating in the Realm of Non-Obstruction Between Phenomena and Phenomena (Shishi Wu'ai Fajie). Famously constructing a Hall of Mirrors surrounding a central lamp and a statue of Vairocana Buddha for Empress Wu Zetian, Fazang visually demonstrated how every single phenomenon in the universe simultaneously contains and reflects every other phenomenon without obstruction—like the infinite jewels of Indra's Net—proving that the one is the many and the many are the one through dependent origination and dependent co-arising.
Harmonizing Nagarjuna's Madhyamaka dialectics regarding emptiness (शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid) with Asanga and Vasubandhu's Yogacara phenomenology and the luminous Buddha-nature (tathagatagarbha) teachings of Maitreya's Uttaratantra Shastra (Toh Number 4024 and Taisho Number 1611) and the Mahaparinirvana Sutra (Taisho Number 374 and Toh Number 119), Fazang demonstrated that true emptiness is not a blank void, but the dynamic, luminous principle from which all harmonious phenomena arise. Showing practitioners how attachment to the five aggregates, anatta, emptiness of self, karma, and rebirth dissolves through piercing right view and non-attachment, he guided disciples to uproot the three poisons of greed, hatred, and delusion through single-pointed meditation, mindfulness, and concentration.
Throughout his teaching career across Chang'an, Luoyang, and Mount Wutai—while maintaining lifelong scholarly correspondence with his Korean Dharma brother Uisang at Buseoksa Temple—Fazang emphasized that exalted philosophical wisdom must always manifest in active compassionate service grounded in Shakyamuni Buddha's foundational teachings on the Four Noble Truths, the Noble Eightfold Path, anicca, and dukkha across the six realms, cultivating generosity, merit, loving-kindness, compassion, equanimity, skillful means, and universal bodhicitta.
Passing into final parinirvana at Da Jianfu Monastery in Chang'an in 712 at the age of sixty-nine amidst extraordinary auspicious signs and deep mourning from Emperor Ruizong of Tang and the entire Chinese Sangha, Fazang left an immortal philosophical and spiritual legacy that shaped all of East Asian Buddhism. Carried forward in China by Chengguan (738–839) and Guifeng Zongmi (780–841), in Korea through Uisang and Wonhyo, and in Japan by Rōben and Myōe at Tōdai-ji in Nara, Fazang stands forever alongside Nagarjuna, Asanga, Zhiyan, Xuanzang, and Longchenpa as a supreme guardian of the Middle Way and full awakening.