Theravada tradition places the Vinaya's formal recitation at the very beginning of the Buddhist textual record: the First Council, held shortly after the Buddha's death to fix the community's teaching before it could be lost or distorted, is said to have opened with the monastic rules rather than with doctrinal discourse, on the reasoning that a community's discipline is the foundation its continued existence depends on. The disciple credited with reciting the Vinaya on that occasion is Upali, remembered in the tradition as the monk most thoroughly versed in the rules, a former barber whose social origin the sources note as itself notable in a monastic community drawn heavily from higher social ranks.
Different early Buddhist schools transmitted their own versions of the Vinaya, agreeing closely in substance but differing in detail and in the exact wording and sequence of individual rules, and the version preserved in the Pali Canon and recorded in this atlas is the one that survived as the living monastic code of Theravada Buddhism specifically, still governing ordination and communal practice in Theravada monasteries today rather than functioning only as historical text. As the basket concerned with lived practice rather than doctrine, the Vinaya sits first among the three pitakas in the traditional ordering this atlas follows, ahead of the Sutta and Abhidhamma baskets that record what the Buddha taught rather than how the community that formed around him was to live.