Abhidhamma Pitaka
Regarding the Abhidhamma Pitaka, the third major division of the Tipitaka, Western scholarship has suggested that the Abhidhamma Pitaka was likely composed starting around 300 BCE because of its contents and differences in language and style. According to Theravada tradition maintained by the Atthakathā-teachers responsible for its memorization, the six canons of Abhidhamma Pitaka, one of its Matika, and the ancient Atthakathā (commentary) were also included at the first Buddhist council in the Sutta category, but its literature is different from Sutta because the Abhidhamma Pitaka was authored by Sāriputta.