Bādarāyaṇa

Badarayana (IAST Bādarāyaṇa; Devanāgari बादरायण) was an Indian philosopher and sage who was the reputed author of the ''Brahma Sutras.'' The Brahma Sutras is a source text for the Hindu philosophical school of Vedānta and one of three texts along with the Upanishads and Bhagavad Gita which establish the prasthantrayi. Estimates of his lifetime vary very widely from around fifth century BCE to third or fourth century CE.

His work ''Brahma Sutras'' is variously dated from 500 BCE to 450 CE. The Brahma Sutras of Bādarāyana, also called the ''Vedanta Sutra'', was compiled in its present form around 400–450 CE, but "the great part of the ''Sutra'' must have been in existence much earlier than that".

Bādarāyana is regarded as having written the basic text of the Vedanta system, the ''Vedāntasūtra'' a.k.a. ''Brahmasūtra''. He is thus considered the founder of the Vedānta system of philosophy. Provided by Wikipedia