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The Tibetan Empire (Tibetan: བོད་ཆེན་པོ, Wylie: bod chen po, lit. 'Great Tibet'; Chinese: 吐蕃; pinyin: Tǔbō / Tǔfān) was an empire centered on the Tibetan Plateau, formed as a result of imperial expansion under the Yarlung dynasty heralded by its 33rd king, Songtsen Gampo, in the 7th century.The empire further expanded under the 38th king, Trisong Detsen.