Explanation:

The first Buddhist Council was held soon after the death of the Buddha, dated by the majority of recent scholars around 400 BCE, under the patronage of the king Ajatashatru with the monk Mahakasyapa presiding, at Sattapanni caves Rajgriha (now Rajgir). Its objective was to preserve the Buddha's sayings (suttas) and the monastic discipline or rules (Vinaya). The Suttas were recited by Ananda, and the Vinaya was recited by Upali. Western scholarship has suggested that the Abhidhamma Pitaka was likely composed starting after 300 BCE because of differences in language and content from other Sutta literature.