The Buddha was a philosopher, mendicant, meditator, spiritual teacher, and religious leader who lived in Ancient India (c. 5th to 4th century BCE). He is revered as the founder of the world religion of Buddhism, and worshiped by most Buddhist schools as the Enlightened One who has transcended Karma and escaped the cycle of birth and rebirth. He taught for around 45 years and built a large following.His teaching is based on his insight into duḥkha and the end of dukkha – the state called  Nirvana.