Silabhadra (शीलभद्र - Śīlabhadra; ཚུལ་ཁྲིམས་བཟང་པོ། tshul khrims bzang po Tsültrim Zangpo, Virtuous Conduct), universally revered across India, China, Tibet, and East Asia as the venerable Abbot of Nalanda Mahavihara and the supreme Indian guru of the famous Chinese pilgrim-translator Xuanzang, stands as one of the greatest Yogacara philosophers and monastic preceptors in Buddhist history. Flourishing in northeastern India during the 6th century and 7th century, with his year of birth around 529 and his year of death around 645, Silabhadra was born into a royal Brahmin family ruling the kingdom of Samatata in southeastern Bengal (modern Bangladesh and eastern India). Gifted with extraordinary intelligence and spiritual curiosity from early youth, he traveled extensively across India seeking the highest truth, eventually practicing fearless renunciation of royal privilege, taking formal refuge in the Buddha, the Dharma, and the Sangha, and receiving full monastic ordination in the Vinaya Pitaka lineage at Nalanda while upholding impeccable ethical conduct and precepts.
At Nalanda in Magadha, Silabhadra became the foremost disciple of the great Yogacara master Dharmapala (530–561), mastering the entire exoteric Tripitaka, Abhidharma, Madhyamaka dialectics, epistemological logic derived from Dignaga, and the profound consciousness-only phenomenology of Asanga and Vasubandhu. At the young age of thirty, Silabhadra achieved fame throughout India by decisively defeating a renowned non-Buddhist scholar from southern India in a grand royal debate convened by the king of Magadha, demonstrating the unassailable truth of Shakyamuni Buddha's teachings on anatta, dependent origination, and emptiness and donating the substantial royal land-grant reward to construct a flourishing monastery.
Rising to become the supreme Chancellor and Abbot of Nalanda, where over ten thousand monks and scholars studied under his guidance, Silabhadra suffered in his later years from a debilitating, agonizing physical illness that caused him such extreme pain that he resolved to fast unto death. According to classical Buddhist chronicles, three radiant bodhisattvas—Manjushri Bodhisattva, Avalokiteshvara Bodhisattva, and Maitreya Bodhisattva—appeared to Silabhadra in a dream, instructing him to endure his karmic affliction with equanimity and remain alive because a noble monk from China was traveling across the deserts and mountains to receive the highest Dharma from him, whereupon Silabhadra's physical agony miraculously vanished upon awakening.
Three years later, in 633 (or 635), the intrepid Chinese pilgrim Xuanzang (602–664) arrived at Nalanda after crossing Central Asia and the Himalayas and prostrated weeping at the feet of the aged, venerated Silabhadra, who was then over one hundred years old. Over the next several years at Nalanda, Silabhadra conferred upon Xuanzang the complete, unbroken oral and textual transmission of the Yogacarabhumi Shastra (Toh Number 4035 in the Tibetan Tripitaka and Taisho Number 1579 in the Chinese Tripitaka), the Samdhinirmocana Sutra (Toh Number 106 and Taisho Number 676), the Vijnaptimatratasiddhi treatises, and Dignaga's epistemological logic, enabling Xuanzang to carry hundreds of Sanskrit manuscripts back to China and establish the East Asian Faxiang (Yogacara) school.
Literarily, Silabhadra composed authoritative philosophical treatises preserved in both the Tibetan Tripitaka and the Chinese Tripitaka, most notably his celebrated commentary on the final chapter of the Buddhabhumisutra, the Buddhabhumivyakhyana (बुद्धभूमिव्याख्यान - Buddhabhūmivyākhyāna; སངས་རྒྱས་ཀྱི་ས་རྣམ་པར་བཤད་པ། sangs rgyas kyi sa rnam par bshad pa Sangyay kyi Sa Nampar Shaypa; Toh Number 3997 in the Tibetan Tripitaka), which was also translated into Chinese by Xuanzang as the Fodijing Lun (佛地經論, Taisho Number 1530), systematically analyzing the five pure dharmas of Buddhahood and the four enlightened wisdoms (jnanas).
Philosophically and contemplatively, Silabhadra upheld the classical Yogacara synthesis of the Three Natures (trisvabhava) and the Eight Consciousnesses (ashtavijnana), demonstrating how ordinary deluded dualism arises through dependent co-arising within the storehouse consciousness (alayavijnana) and is transformed through meditation, mindfulness, and single-pointed concentration into non-conceptual primordial wisdom. Harmonizing Asanga's insights into innate Buddha-nature (tathagatagarbha) with Nagarjuna's teachings on emptiness (शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid), he showed practitioners how attachment to the five aggregates, emptiness of self, karma, and rebirth dissolves through piercing right view and non-attachment.
Throughout his long tenure as Abbot of Nalanda—where he enjoyed the deep reverence of Emperor Harshavardhana of Kanauj and guided thousands of Indian and foreign disciples—Silabhadra emphasized that subtle philosophical inquiry must always serve the practical uprooting of the three poisons of greed, hatred, and delusion. Anchoring his monastic community in Shakyamuni Buddha's foundational teachings on the Four Noble Truths, the Noble Eightfold Path, anicca, and dukkha across the six realms, he cultivated generosity, merit, loving-kindness, compassion, skillful means, and universal bodhicitta.
Passing into final parinirvana at Nalanda around 645 at the remarkable age of over one hundred and fifteen amidst deep veneration from the entire Sangha of India, Silabhadra left an immortal intellectual and spiritual legacy that shaped both Indo-Tibetan scholasticism and East Asian Buddhism. Carried forward in China, Korea, and Japan through Xuanzang and Kuiji (632–682), and preserved in the Tibetan Tripitaka through his Buddhabhumivyakhyana, Silabhadra stands forever alongside Asanga, Vasubandhu, Dharmapala, Shantarakshita, and Atisha as a supreme guardian of the Middle Way and full awakening.