Who Was Gautama Buddha?

From Wikipedia:
Siddhārtha Gautama (Sanskrit: सिद्धार्थ गौतम; Pali: Siddhattha Gotama) was a spiritual teacher in the north eastern region of the Indian subcontinent who founded Buddhism.[1] He is regarded by Buddhists as the Supreme Buddha (Sammāsambuddha) of our age. The time of his birth and death are uncertain: Most early 20th-century historians dated his lifetime as c. 563 BCE to 483 BCE; more recently, however, at a specialist symposium on this question,[2] 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.[3]