Adi Shankaracharya (Sanskrit: आदि शङ्कराचार्य; c. 700-750 CE, dates disputed) was an Indian philosopher, theologian, and religious reformer whose consolidation and systematization of Advaita Vedanta - the non-dualist school of Hindu philosophy - became one of the most influential intellectual achievements in South Asian religious history. He is credited with composing extensive commentaries on the Upanishads, the Bhagavad Gita, and the Brahma Sutras, and with establishing four monastic centers (mathas) across the Indian subcontinent that continue to function today. His title “Shankaracharya” combines his name with the Sanskrit term for a revered teacher (acharya); “Adi” (first, original) distinguishes him from later teachers who held the same title.

Shankaracharya was born in Kaladi, in what is now the state of Kerala, India. Traditional hagiographies place his dates in the 8th century CE, though some Hindu traditions assign him dates as early as 509-477 BCE. Modern scholarly consensus places him in the late 7th to mid-8th century CE, though this remains a subject of discussion. According to tradition, he became a sannyasi (renunciant) at a young age, traveled extensively throughout the subcontinent engaging in philosophical debate, and died young - accounts vary between 32 and 56 years of age.

He is said to have debated prominent thinkers of rival schools, including the Mimamsakas, the Buddhists, and the Vaishnavite philosopher Mandana Mishra. His travels retraced a significant portion of India, and the four mathas he founded - at Sringeri (south), Dwaraka (west), Puri (east), and Jyotirmath (north) - reflect a deliberate geographic structure. The historicity of specific episodes in his life is difficult to verify and is treated differently by devotional and academic sources.

A more detailed treatment of his life and the religious environment of his era is available at Adi Shankaracharya - History.

The philosophical system Shankaracharya consolidated, Advaita (non-dual) Vedanta, holds that the individual self (atman) and ultimate reality (Brahman) are not two distinct things but identical - the appearance of multiplicity and individuality is attributed to maya, a term variously translated as illusion, appearance, or the creative power of Brahman. His commentaries argued that the Upanishads, properly interpreted, teach this non-dual position, and he offered systematic responses to rival readings.

His most technically demanding work is generally considered to be his commentary on the Brahma Sutras (Brahmasutra-bhashya). He also authored independent texts including Vivekachudamani (Crest Jewel of Discrimination), though the attribution of some works to him directly rather than to his school remains a matter of scholarly discussion.

Shankaracharya's synthesis substantially shaped subsequent Hindu intellectual life. His framework for distinguishing levels of reality (vyavaharika, conventional; paramarthika, absolute) allowed him to accommodate devotional practice and ritual at a pragmatic level while maintaining metaphysical non-dualism. Later Vedanta schools, including Ramanuja's Vishishtadvaita and Madhva's Dvaita, developed in explicit dialogue with and opposition to his positions.

The four mathas he founded continue to appoint successors who also bear the title Shankaracharya and serve as religious authorities within their respective traditions. These institutions have periodically issued pronouncements on theological and cultural matters, sometimes generating public controversy in contemporary India.

There is broad scholarly consensus that Shankaracharya was a historical figure of the early medieval period and that his commentaries form the textual foundation of Advaita Vedanta. His precise dates, the full extent of his authentic writings, and details of his biography remain contested among scholars. See Adi Shankaracharya - Indology Consensus for a summary of the academic literature.

Traditional Hindu/Devotional: Many Hindu traditions, particularly those affiliated with the Advaita mathas, regard Shankaracharya as an avatar of Shiva or as a uniquely realized sage. His works are authoritative scripture within these traditions. See Traditional Devotional Viewpoint.

Academic/Indological: Historians of South Asian religion approach Shankaracharya as a historical figure whose biography is substantially hagiographical, whose dates are uncertain, and whose textual corpus requires critical philological analysis. See Academic/Indological Viewpoint.

Rival Vedanta Schools: Vishishtadvaita (Ramanuja), Dvaita (Madhva), and other Vedanta traditions accept Shankaracharya's historical importance but contest his interpretation of the Upanishads and Brahma Sutras, arguing that his non-dualism misreads the texts. See Rival Vedanta Schools Viewpoint.

Buddhist and Jain Perspectives: Some scholars within these traditions have argued that Shankaracharya's Advaita is substantially derived from Buddhist philosophy - a position that is itself contested. Traditional Hindu defenders reject this characterization. See Buddhist Influence Debate-viewpoint.

• Adi Shankaracharya - History
• Adi Shankaracharya - Debate
• Adi Shankaracharya - Indology Consensus
• Advaita Vedanta
• Vedanta
• Upanishads
• Brahma Sutras
• Hindu Philosophy
• Ramanuja
• Madhvacharya

[(1) Comans, Michael. The Method of Early Advaita Vedanta: A Study of Gaudapada, Sankara, Suresvara and Padmapada. Motilal Banarsidass, 2000.] [(2) Hacker, Paul. Vivarta: Studien zur Geschichte der Illusionslehre und der Erkenntnistheorie der Inder. Akademie der Wissenschaften und der Literatur, 1953. Hacker's philological work on authenticating texts in the Shankara corpus remains influential in academic Indology.] [(3) Isaeva, Natalia. Shankara and Indian Philosophy. State University of New York Press, 1993.] [(4) Potter, Karl H., ed. Encyclopedia of Indian Philosophies, Vol. 3: Advaita Vedanta up to Samkara and His Pupils. Princeton University Press, 1981.] [(5) Roodurmun, Pulasth Soobah. Bhāmatī and Vivaraṇa Schools of Advaita Vedānta: A Critical Approach. Motilal Banarsidass, 2002.]