Abhidhamma Pitaka
The Pāli Tipitaka consists of three parts: the Vinaya Pitaka, Sutta Pitaka and Abhidhamma Pitaka. Of these, the Abhidhamma Pitaka is believed to be a later addition to the collection, its composition dating from around the 3rd century BCE onwards. The Pāli Abhidhamma was not recognized outside the Theravāda school. There are also some texts which were late additions that are included in the fifth Nikaya, the "Khuddaka Nikāya" ('Minor Collection'), such as the "Paṭisambhidāmagga" (possibly c. 3rd to 1st Century BCE) and the "Buddhavaṃsa" (c. 1st and 2nd century BCE).