Buddhists is a world religion, which arose in and around the ancient Kingdom of Magadha – Bihar, India, and is based on the teachings of Siddhartha Gautama who was deemed a "Buddha". Buddhist spread outside of Magadha starting in the Buddha's lifetime.
With the reign of the Buddhist Mauryan Emperor Ashoka, the Buddhist community split into two branches: the Mahasaṃghika and the Sthaviravada, each of which spread throughout India and split into numerous sub-sects. In modern times, two major branches of Buddhism exist: the Theravada in Sri Lanka & Southeast Asia, and the Mahayana throughout the Himalayas & East Asia.
The practice of Buddhist as a distinct and organized religion lost influence after the Gupta reign, and declined from the land of its origin in around 13th century, but not without leaving a significant impact. Buddhist practice is most common in Himalayan areas like Arunachal Pradesh, Ladakh and Sikkim.