" The great difference is that this version relies on the work of W. W. Rockhill. Rockhill was an American diplomat who lived in China in the nineteenth century, a linguistic genius—he must have been the first American to know Tibetan; he also produced a Chinese-English dictionary. And in 1884 he published a life of the Buddha according to the Tibetan canoṇ It draws from material of equivalent antiquity to that of the Pali Canon, from a source called the Mūlasarvāstivāda Vinaya. He went through it in the 1870s and pulled out of it a story that is almost identical to the story that I reconstructed from the Pali materials. Somewhat embarrassingly, I hadn’t actually read Rockhill until quite recently. I didn’t think the Tibetan material would be relevant. But I was wrong. The Tibetan Vinaya, from the Mūlasarvāstivāda school, gives us the same story, with the same characters, and the same relationships. The two versions don’t agree in every detail, but they’re remarkably similar. "

― Stephen Batchelor , Secular Buddhism: Imagining the Dharma in an Uncertain World