This historical document was found in the ‘library’ cave at Dunhuang. It contains a narrative, in a mixture of prose and verse, describing and praising the greatness and activities of Tibet’s rulers. It is concerned with the proper relationship between ruler and subjects, which are illustrated with examples of just and unjust conduct. The early emperors are said to have expanded their realms through superior moral qualities, as well as military prowess.
PT 1287 is a military and political history of the kings of Tibet. It refers to the emperor Songtsen Gampo (Srong btsan sgam po) making a great code of law for the Tibetan people.