Door to the dharma
This is a short text written by bSod nams rtse mo (1142–1182), a Buddhist scholar of the Khon clan, who is regarded as one of the founding fathers of the Sakya (Sa skya) tradition. The text was completed in 1167/68. It serves as an introduction to Buddhism and deals mainly with the life of the Buddha.
It contains a passage giving a brief reference to Songtsen Gampo’s (Srong brtsan sgam po) law-making.