Adi Shankara (8th c. CE), also called Adi Shankaracharya (Sanskrit: आदि शङ्कर, आदि शङ्कराचार्य, romanized: Ādi Śaṅkara, Ādi Śaṅkarācārya, lit. 'First Shankaracharya', pronounced [aːd̪i ɕɐŋkɐraːt͡ɕaːrjɐ]), was an Indian Vedic scholar-monk, philosopher, and teacher (acharya) of Advaita Vedanta, who has become known in the popular perception as a heroic religious leader who re-established traditional Hinduism. While in recent times he is often revered as the most important Indian philosopher, reliable information on Shankara's actual life is scant, and the historical influence of his works on Hindu intellectual thought has been questioned. The historical Shankara was probably relatively unknown and Vaishna-oriented. His true impact lies in his "iconic representation of Hindu religion and culture," despite the fact that most Hindus do not adhere to Advaita Vedanta. Until the 10th century Shankara was overshadowed by his older contemporary Maṇḍana Miśra, and there is no mention of him in concurrent Hindu, Buddhist or Jain sources until the 11th century. The legendary Shankara was created in the 14th century, centuries after his death, when Sringeri matha started to receive patronage from the emperors of the Vijayanagara Empire and shifted their allegiance from Advaitic Agamic Shaivism to Brahmanical Advaita orthodoxy. Hagiographies dating from the 14th-17th centuries deified him as a ruler-renunciate, travelling on a digvijaya (conquest of the four quarters) across the Indian subcontinent to propagate his philosophy, defeating his opponents in theological debates. These hagiographies also portray him as founding four mathas (monasteries), and Adi Shankara also came to be regarded as the organiser of the Dashanami monastic order, and the unifier of the Shanmata tradition of worship. The title of Shankaracharya, used by heads of certain monasteries in India, is derived from his name. Tradition also portrays him as the one who reconciled the various sects (Vaishnavism, Shaivism, and Shaktism) with the introduction of the Pañcāyatana form of worship, the simultaneous worship of five deities – Ganesha, Surya, Vishnu, Shiva and Devi, arguing that all deities were but different forms of the one Brahman, the invisible Supreme Being. Owing to his later fame over 300 texts are attributed to him, including commentaries (Bhāṣya), introductory topical expositions (Prakaraṇa grantha) and poetry (Stotra). However, most of these are likely to have been written by admirers, or pretenders, or scholars with an eponymous name. Works known to have been written by Shankara himself are the Brahmasutrabhasya, his commentaries on ten principal Upanishads, his commentary on the Bhagavad Gita, and the Upadeśasāhasrī. The authenticity of Shankara as the author of Vivekacūḍāmaṇi has been questioned and mostly rejected by scholarship. His authentic works present a harmonizing reading of the shastras, with liberating knowledge of the self at its core, synthesizing the inherited Advaita Vedanta teachings of his time. The central concern of Shankara's writings was the liberating knowledge of the true identity of jivatman (individual self) as Ātman-Brahman, taking the Upanishads as the authoritative means of knowledge, beyond the ritually oriented Mīmāṃsā-exegesis of the Vedas. Shankara's Advaita showed influences from Mahayana Buddhism, despite Shankara's critiques; and Hindu Vaishnava opponents have even accused Shankara of being a "crypto-Buddhist," a qualification which is rejected by the Advaita Vedanta tradition, highlighting their respective views on Atman, Anatta and Brahman. Source: Wikipedia (en)