An important Abhidhamma work from the Theravāda school is the Kathāvatthu ("Points of controversy"), attributed to the Indian scholar-monk Moggaliputta-Tissa (ca.327–247 BCE). This text is important because it attempts to refute several philosophical views which had developed after the death of the Buddha, especially the theory that 'all exists' ("sarvāstivāda"), the theory of momentariness ("khāṇavāda") and the personalist view ("pudgalavada") These were the major philosophical theories which divided the Buddhist Abhidharma schools in India. After being brought to Sri Lanka in the first century BCE, the Theravada Pali language Abhidhamma tradition was heavily influenced by the works of Buddhaghosa (4-5th century AD), the most important philosopher and commentator of the Theravada school. The Theravada philosophical enterprise was mostly carried out in the genre of Atthakatha, commentaries (as well as sub-commentaries) on the Pali Abhidhamma, but also included short summaries and compendiums.