Siddhārtha Gautama was a spiritual teacher in the northern region of the Indian subcontinent who founded Buddhism. He is generally seen by Buddhists as the Supreme Buddha of our age. The time of his birth and death are uncertain: most early 20th-century historians date his lifetime from 563 BCE to 483 BCE; more recently, however, at a specialist symposium on this question, the majority of those scholars who presented definite opinions gave dates within 20 years either side of 400 BCE for the Buddha’s death, with others supporting earlier or later dates. Gautama is the key figure in Buddhism, and accounts of his life, discourses, and monastic rules are believed by Buddhists to have been summarized after his death and memorized by his followers. Various collections of teachings attributed to Gautama were passed down by oral tradition, and first committed to writing about 400 years later. Early Western scholarship tended to accept the biography of the Buddha presented in the Buddhist scriptures as largely historical, but currently “scholars are increasingly reluctant to make unqualified claims about the historical facts of the Buddha’s life and teachings.”
Click on the link for a more complete biography of Buddha.