The Tibetan Empire was a historical state that existed from the 7th to the 9th centuries in Central Asia. It was established under the leadership of Songtsen Gampo, who unified various Tibetan tribes and expanded the empire's territory. The empire played a significant role in the spread of Buddhism in the region and established diplomatic relations with neighboring states, including China and India. At its height, the Tibetan Empire controlled vast areas, including parts of present-day China, Nepal, and India. The empire's influence declined after the death of Songtsen Gampo, leading to internal strife and fragmentation. Despite its fall, the legacy of the Tibetan Empire continues to impact Tibetan culture and religion today.