Songtsen Gampo turned a valley kingdom into Great Tibet
Under Yarlung king Songtsen Gampo in the seventh century, Tibet leapt from the Yarlung Valley to a plateau empire later stretched by Trisong Detsen and Tritsuk Detsen. Chinese princess Wencheng’s 641 arrival is traditionally tied to Buddhism’s court debut.
Dynasty lore starts in 127 BC along the Yarlung River, and the Old Tibetan Chronicle traces the state to Taktsé Castle, where plotters persuaded Tagbu Nyazig to rise against Gudri Zingpoje. The name Bod first meant only a conquered part of the plateau. Songtsen Gampo moved the capital from Yungbulakang toward Lhasa. After his father Namri Songtsen was poisoned around 618, he put down a brief revolt; his minister Myang Mangpoje beat the Sumpa around 627, and in 635–36 Tibet defeated the Tuyuhun near Kokonor after Tang China refused a marriage request in 634.
Family politics were brutal. Around 639 his younger brother Tsänsong was burned to death by a minister, presumably on the king’s orders. His sister Sämakar, married to the Zhangzhung king Lig-myi-rhya, helped Songtsen defeat her husband when he spurned her, bringing Zhangzhung into the empire, though some scholars date that conquest to Trisong Detsen’s reign instead.
Songtsen died in 650, leaving an infant grandson, Trimang Lön, while real power passed to the minister Gar Tongtsen. Tibet crushed the Tuyuhun buffer state in 663, beat Khotan between 665 and 670, and began a long rivalry with the Tang. Later the Tarim Basin was lost in 692, a Gar general beat Chinese forces in 696, and in 702 Tibet made peace with the Zhou state of Empress Wu Zetian while the queen mother Thrimalö governed for her campaigning son.
Tradition credits Songtsen with Tibetan script and the first royal Buddhism, following relics already guarded under the 28th king, Thothori Nyantsen, though practice probably stayed among foreign courtiers at first. The era of Religious Kings ended after Ralpachen’s murder, when Langdarma turned on Nyingma monasteries. Some writers add that rugged terrain, slow transport, and rival power blocs strained the monarchy.
Source: Tibetan Empire
