Adi Shankara (8th c. CE), also called Adi Shankaracharya (, ), was an Indian Vedic scholar-monk, philosopher, and teacher (acharya) of Advaita Vedanta. He wrote influential commentaries on the Brahma sutras and other texts, and in recent times 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 Vaishnava-oriented and his true impact lies in the popular perception of him as a heroic religious leader who re-established traditional Hinduism.

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 (Sanskrit: )(maṭha) (monasteries) started to receive patronage from the emperors of the Vijayanagara Empire and shifted their allegiance from Advaitic Agamic Shaivism (Śaivism) 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. 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 Panchayatna () 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 (Bhashya, 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 Updeshsahasri (Upadeśasāhasrī). The authenticity of Shankara as the author of Vivekchudamani () 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. Also, as per astronomical details given in books Shankara Satpatha, Shankara Vijaya, Brihat Shakara Vijaya and Prachina Shankara Vijaya, it is believed that Shankaracharya was born in 509 BCE. According to Kanhi Peetham, having established his divine mission, the incomparable Sankara attained his BrahmTbhava (identity with Brahman) at Kanchi, in the precincts of Sri Kamakshi, in his 32nd year, in 2625 Kali, in the cyclic year Raktakshi, corresponding to 476 B.C. 507 BCE according to Govardhan Math, 491 BCE according to Dvarka (Dvārakā), 485 BCE according to Jyotirmath, 484 BCE according to Jagannatha Puri, and 483 BCE according to Sringeri.

The records of the Sringeri Matha state that Shankara was born in the 14th year of the reign of "Vikramaditya", but it is unclear to which king this name refers. Though some researchers identify the name with Chandragupta II (4th century CE), modern scholarship accepts the Vikramaditya as being from the Chalukya dynasty of Badami, most likely Vikramaditya II (733–746 CE). According to Frank Whaling, some Hindus, particularly those who follow Advaita, view Shankara as someone who defended Hindu dharma in response to Buddhist and Jain challenges and contributed to the decline of Buddhism in India. His teachings and tradition are central to Smartism and have influenced Sant Mat lineages. Tradition portrays him as the one who reconciled the various sects (Vaishnavism, Shaivism, and Shaktism) with the introduction of the Panchayatna 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, The "theory of error" set forth in the Brahma-siddhi became the normative Advaita Vedanta theory of error, and for a couple of centuries he was the most influential Vedanti (Vedāntin). His student Vachaspati Mishra (Vachaspati Miśra), who is believed to have been an incarnation of Shankara to popularize the Advaita view, wrote the Bhamati(Bhāmatī), a commentary on Shankara's Brahma Sutra Bhashya, and the Brahmatattva-samiksa, a commentary on Mandana Mishra's Brahma-siddhi. His thought was mainly inspired by Mandana Mishra, and harmonises Shankara's thought with that of Mandana Mishra. The Bhamati school takes an ontological approach. It sees the jiva (jīva) as the source of avidya (avidyā). believing that Maṇḍana Mishra became a disciple of Shankara after a public debate which Shankara won.

According to Satchidanandendra Sarasvati, "almost all the later Advaitis were influenced by Mandana Mishra and Bhaskara." He argues that most post-Shankara Advaita Vedanta actually deviates from Shankara, and that only his student Sureshvara - who has had little influence represents Shankara correctly. In this view, Shankara's influential student Padmapada misunderstood Shankara, while his views were maintained by the Sureshvara school.

Vaishnavite Vedanta (10th-14th century)

Hajime Nakamura states that prior to Shankara, views similar to his already existed, but did not occupy a dominant position within the Vedanta. Until the 11th century, Vedanta itself was a peripheral school of thought; Vedanta became a major influence when it was utilized by various sects of Hinduism to ground their doctrines. The early Vedanta scholars were from the upper classes of society, well-educated in traditional culture. They formed a social elite, "sharply distinguished from the general practitioners and theologians of Hinduism." Their teachings were "transmitted among a small number of selected intellectuals". Works of the early Vedanta schools do not contain references to Vishnu or Shiva. It was only after Shankara that "the theologians of the various sects of Hinduism utilized Vedanta philosophy to a greater or lesser degree to form the basis of their doctrines," whereby "its theoretical influence upon the whole of Indian society became final and definitive." Examples are Ramanuja (11th c.), who aligned bhakti, "the major force in the religions of Hinduism," with philosophical thought, meanwhile rejecting Shankara's views, and the Nath-tradition.

Vijayanagara Empire and Vidyaranya (14th century) - creation of legendary (hagiographic) views

In medieval times, Advaita Vedanta position as most influential Hindu darsana started to take shape, as Advaitins in the Vijayanagara Empire competed for patronage from the royal court, and tried to convert others to their sect. It is only during this period that the historical fame and cultural influence of Shankara and Advaita Vedanta was established. Many of Shankara's biographies were created and published in and after the 14th century, such as Vidyaranya's widely cited Śankara-vijaya. Vidyaranya, also known as Madhava, who was the 12th Jagadguru of the Śringeri Śarada Pītham from 1380 to 1386 and a minister in the Vijayanagara Empire, but his efforts were also targeted at Sri Vaishnava groups, especially Visishtadvaita, which was dominant in territories conquered by the Vijayanagara Empire. Furthermore, sects competed for patronage from the royal court, and tried to convert others to their own sectarian system. Vidyaranya and his brothers, note Paul Hacker and other scholars, wrote extensive Advaitic commentaries on the Vedas and Dharma to make "the authoritative literature of the Aryan religion" more accessible. Vidyaranya was an influential Advaitin, and he created legends to turn Shankara, whose elevated philosophy had no appeal to gain widespread popularity, into a "divine folk-hero who spread his teaching through his digvijaya ("universal conquest," see below) all over India like a victorious conqueror." In his doxography Sarvadarśanasaṅgraha ("Summary of all views") Vidyaranya presented Shankara's teachings as the summit of all darsanas, presenting the other darsanas as partial truths which converged in Shankara's teachings, which was regarded to be the most inclusive system. The Vaishanava traditions of Dvaita and Visishtadvaita were not classified as Vedanta, and placed just above Buddhism and Jainism, reflecting the threat they posed for Vidyaranya's Advaita allegiance. Bhedabheda wasn't mentioned at all, "literally written out of the history of Indian philosophy." Such was the influence of the Sarvadarśanasaṅgraha, that early Indologists also regarded Advaita Vedanta as the most accurate interpretation of the Upanishads. And Vidyaranya founded a matha, proclaiming that it was established by Shankara himself. Vidyaranya enjoyed royal support,

Scholars note that one of the most cited Shankara hagiographies, Anandagiri's, includes stories and legends about historically different people, but all bearing the same name of Sri Shankaracarya or also referred to as Shankara but likely meaning more ancient scholars with names such as Vidya-sankara, Sankara-misra and Sankara-nanda. Some hagiographies are probably written by those who sought to create a historical basis for their rituals or theories.

Early life

According to the oldest hagiographies, Shankara was born in the southern Indian state of Kerala, in a village named Kaladi sometimes spelled as Kalati or Karati. His parents were an aged, childless, couple who led a devout life of service to the poor. They named their child Shankara, meaning "giver of prosperity". His father died while Shankara was very young. Shankara's , the initiation into student-life, had to be delayed due to the death of his father, and was then performed by his mother.

Sannyasa

Shankara's hagiographies describe him as someone who was attracted to the life of Sannyasa (hermit) from early childhood. His mother disapproved. A story, found in every hagiography, describes Shankara at age eight going to a river with his mother, Sivataraka, to bathe, where he is caught by a crocodile. Shankara calls out to his mother to give him permission to become a Sannyasin (a religious ascetic), or else the crocodile will kill him. The mother agrees and Shankara is freed, and leaves his home for education. He reaches a Saivite sanctuary along a river in a north-central state of India, and becomes the disciple of a teacher named Govinda Bhagavatpada. The stories in various hagiographies diverge in details about the first meeting between Shankara and his Guru, where they met, as well as what happened later. Several texts suggest Shankara's schooling with Govindapada happened along the river Narmada in Omkareshwar, but a few place it along the River Ganges in Kashi (Varanasi) as well as Badari (Badrinath in the Himalayas).

The hagiographies vary in their description of where he went, who he met and debated and many other details of his life. Most mention Shankara studying the Vedas, Upanishads and Brahmasutra with Govindapada, and Shankara authoring several key works in his youth, while he was studying with his teacher. It is with his teacher Govinda, that Shankara studied Gaudapadiya Karika, as Govinda was himself taught by Gaudapada. Most also mention a meeting with scholars of the Mimansa school of Hinduism namely Kumarila and Prabhakara, as well as Mandana and various Buddhists, in Shastrartha (an Indian tradition of public philosophical debates attended by large number of people, sometimes with royalty).

Travels (Digvijaya) and disciples

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Thereafter, the hagiographies about Shankara vary significantly. Different and widely inconsistent accounts of his life include diverse journeys, pilgrimages, public debates, installation of yantras and lingas, as well as the founding of monastic centers in north, east, west, and south India.

While the details and chronology vary, most hagiographies present Shankara as traveling widely within India, Gujarat to Bengal, and participating in public philosophical debates with different orthodox schools of Hindu philosophy, as well as heterodox traditions such as Buddhists, Jains, Arhatas, Saugatas, and Charvakas. The hagiographies credit him with starting several matha (monasteries), but this is uncertain. Ten monastic orders in different parts of India are generally attributed to Shankara's travel-inspired Sannyasin schools, each with Advaita notions, of which four have continued in his tradition: Bharati (Sringeri), Sarasvati (Kanchi), Tirtha and Asramin (Dvaraka). Other monasteries that record Shankara's visit include Giri, Puri, Vana, Aranya, Parvata and Sagara – all names traceable to the Ashrama system in Hinduism and Vedic literature.

Shankara had a number of disciple scholars during his travels, including Padmapadacharya(also called Sanandana, associated with the text Atma-bodha), Sureśvaracharya, Totakacharya, Hastamalakacharya, Chitsukha, Prthividhara, Chidvilasayati, Bodhendra, Brahmendra, Sadananda and others, who authored their own literature on Shankara and Advaita Vedanta.

Death

According to hagiographies, associated with the four maths, Adi Shankara died at Kedarnath, a Hindu pilgrimage site in the Himalayas, located in the northern Indian state of Uttarakhand. Texts say that he was last seen by his disciples behind the Kedarnath temple, walking into the Himalayas until he could no longer be traced. Some texts locate his death in alternate locations such as Kanchipuram in Tamil Nadu or in Kerala. According to the hagiographies related to the monastery of Kanchi, Adi Shankara attains siddhi in Kanchi.

Hagiographies: attribution of Mathas and Smarta tradition (14-17th century)

Traditionally, Shankara is regarded as the founder of the of Hindu monasticism, and the Panchayatana puja and Shanmata| of the Smarta tradition.

Dashanami Sampradaya and mathas

Advaita Vedanta is, at least in the west, primarily known as a philosophical system. But it is also a tradition of renunciation. Philosophy and renunciation are closely related: Several other Hindu monastic and Ekadandi traditions, however, remained outside the organisation of the Dasanāmis.

According to tradition, Adi Sankara organised the Hindu monks of these ten sects or names under four mathas, with the headquarters at Dvārakā in the West, Jagannatha Puri in the East, Sringeri in the South and Badrikashrama in the North. It consists of the worship of five deities set in a quincunx pattern, the five deities being Shiva, Vishnu, Devi, Surya, and an Ishta Devata such as Kartikeya, or Ganesha or any personal god of devotee's preference. Sometimes the Ishta Devata is the sixth deity in the mandala. Skanda, also known as Kartikeya and Murugan, is added. Panchayatana puja is a practice that became popular in medieval India, However, archaeological evidence suggests that this practice long predates the birth of Adi Shankara.