Badarayana (IAST Bādarāyaṇa; Devanāgari बादरायण) was an Indian philosopher, who is estimated to have lived around 500 BCE - 200 BCE.His work Brahma Sutras is variously dated from 500 BCE to 450 CE.
The Brahma Sutras of Bādarāyana, also called the Vedanta Sutra, were 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”. Estimates of the date of Bādarāyana’s lifetime differ between 200 BCE and 200 CE.
Badarayana 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.