Early Buddhist schools
The early Buddhist schools are those schools into which the Buddhist monastic saṅgha split early in the history of Buddhism. The divisions were originally due to differences in Vinaya and later also due to doctrinal differences and geographical separation of groups of monks. The original saṅgha split into the first early schools (generally believed to be the Sthavira nikāya and the Mahāsāṃghika) during or after the reign of Aśoka. Later, these first early schools were further divided into schools such as the Sarvāstivādins, the Dharmaguptakas, and the Vibhajyavāda, and ended up numbering 18 or 20 schools according to traditional accounts. The textual material shared by the early schools is often termed the Early Buddhist Texts and these are an important source for understanding their doctrinal similarities and differences. First Buddhist council According to the scriptures (Cullavagga XI.1 ff), three months after the parinirvana of Gautama Buddha, a council was held at Rajagaha Rajgir) by some of his disciples who had attained arahantship, presided over by Mahākāśyapa, one of his most senior disciples, and with the support of king Ajātasattu, reciting the teachings of the Buddha. The accounts of the council in the scriptures of the schools differ as to what was actually recited there. Purāṇa is recorded as having said: "Your reverences, well chanted by the elders are the Dhamma and Vinaya, but in that way that I heard it in the Lord's presence, that I received it in his presence, in that same way will I bear it in mind." [Vinaya-pitaka: Cullavagga XI:1:11]. According to Theravāda tradition, the teachings were divided into various parts and each was assigned to an elder and his pupils to commit to memory, and there was no conflict about what the Buddha taught. Some scholars argue that the first council actually did not take place. The expansion of orally transmitted texts in early Buddhism, and the growing distances between Buddhist communities, fostered specialization and sectarian identification.