It is only in Khotan that tradition, if not history, gives a more detailed narrative. This is found in the works of the Chinese pilgrims Hsüan Chuang and Sung Yün and also in four Tibetan works which are apparently translated from the language of Khotan[518]. As the story is substantially the same in all, it merits consideration and may be accepted as the account current in the literary circles of Khotan about 500 A.D. It relates that the Indians who were part-founders of that city in the reign of Asoka were not Buddhists[519] and the Tibetan version places the conversion with great apparent accuracy 170 years after the foundation of the kingdom and 404 after the death of the Buddha. At that time a monk named Vairocana, who was an incarnation of Manjuśri, came to Khotan, according to Hsüan Chuang from Kashmir[520]. He is said to have introduced a new language as well as Mahâyânism, and the king, Vijayasambhava, built for him the great monastery of Tsarma outside the capital, which was miraculously supplied with relics. We cannot be sure that the Tibetan dates were intended to have the meaning they would bear for our chronology, that is about 80 B.C., but if they had, there is nothing improbable in the story, for other traditions assert that Buddhism was preached in Kashmir in the time of Asoka. On the other hand, there was a dynastic change in Khotan about 60 A.D. and the monarch who then came to the throne may have been Vijayasambhava.
According to the Tibetan account no more monasteries were built for seven reigns. The eighth king built two, one on the celebrated Gośirsha or Gośringa mountain. In the eleventh reign after Vijayasambhava, more chaityas and viharas were built in connection with the introduction of the silkworm industry. Subsequently, but without any clear indication of date, the introduction of the Mahâsanghika and Sarvâstivâdin schools is mentioned.
The Tibetan annals also mention several persecutions of Buddhism in Khotan as a result of which the monks fled to Tibet and Bruzha. Their chronology is confused but seems to make these troubles coincide with a persecution in Tibet, presumably that of Lang-dar-ma. If so, the persecution in Khotan must have been due to the early attacks of Mohammedans which preceded the final conquest in about 1000 A.D.[521]