Adi Shankara was an 8th-century Indian scholar and teacher of Hinduism. He is known for his contribution to Advaita Vedanta philosophy, which asserts the identity of the self and Brahman. Although over 300 texts are attributed to him, only a few are considered authentic. These include the Brahmasutrabhasya, his commentaries on ten principal Upanishads, his commentary on the Bhagavad Gita, and the Upadeśasāhasrī. Shankara's writings were influenced by Mahayana Buddhism and he has been accused of being a "crypto-Buddhist." Shankara's status in the tradition of Advaita Vedanta is unparalleled, but his influence on Hindu intellectual thought has been questioned. Not much is known about Shankara until the 11th century when he is first mentioned in Hindu, Buddhist, and Jain sources.