Buddha was born at a place called Lumbani which is a town of current Nepal. After he left his empire he came a place called Sarnath near Varanasi where he got the Param Jnan. His childhood name was Siddartha who became Gautam Buddha after it.
Gautam Buddha is the primary 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.