Route
Chang'an (Xi'an) to Lhasa
The Tang–Tibet Road ran from Chang'an (Xi'an) ...
The Tang–Tibet Road ran from Chang'an (Xi'an) to Lhasa, capital of the Tibetan empire — an official route of over three thousand kilometers across Shaanxi, Gansu, Qinghai, Sichuan and Tibet, and the key passage of Han-Tibetan politics, religion and trade. In 641 Princess Wencheng traveled it to marry Songtsen Gampo; in the two centuries after, envoys crossed between the courts more than a hundred and ninety times, 'jade and silks passing each other on the road.' Crossing Sun-and-Moon Mountain, the Tongtian River and the Tanggula passes, it was the highest ancient official road on earth; thangkas, monasteries, steles and legends still line its course, witnessing the long kinship of Han and Tibetan peoples.
In 641 Emperor Taizong of Tang gave Princess Wencheng, a daughter of the imperial clan, to Songtsen Gampo of Tibet. The escort left Chang'an along the Wei, over the Long mountains, through Qinghai, over Sun-and-Moon Mountain and across the Tongtian River — nearly three years to Lhasa. The dowry carried grain seed, craftsmen, medical and calendrical texts: less a wedding than a large-scale transfer of civilization.
The twelve-year-old statue of the Buddha said to be her dowry still stands in the Jokhang in Lhasa; Tibetan epic and opera have sung her for a thousand years, and 'A-jia A-sha' — Han elder sister — is the plateau's most affectionate name for her. A political marriage grew into family memory.
After Wencheng came Princess Jincheng (710), and the two houses vowed to be 'as one family.' Envoys crossed more than a hundred and ninety times in two centuries; the road was a working diplomatic artery — the Tang-Tibet Alliance Stele of 823 still stands before the Jokhang, its words 'the two states as one' the most solemn signature of peace two powers could offer.
The road saw war and reconciliation both: great battles between Tang and Tibet, and then the covenant of 'uncle and nephew, one realm.' The road is more honest than monuments — wars stopped, the road kept walking; envoys, caravans and pilgrims walked peace into fact, again and again.
The road joined the civilizations of the Central Plains and the snowlands: medicine, calendrics, paper and architecture went up to Tibet; horses, gold work and Buddhist art came down to Tang. The monasteries along the line — Ta'er (Kumbum), Jiegu — were faith centers and caravan inns, stations of culture as much as worship.
Today's highways and the Qinghai–Tibet railway run close to the princess's wheel tracks; before the Princess Wencheng Temple the prayer flags fly, and drivers pause with khata scarves. A fourteen-hundred-year-old official road is now the busiest corridor between Han and Tibetan lands — the road changed; the reason for walking it did not.