In Sri Lanka and South India, the Theravāda Abhidhamma system was the most influential. In addition to the Abhidharma project, some of the schools also began accumulating a literary tradition of scriptural commentary on their respective Tripitakas. These commentaries were particularly important in the Theravāda school, and the Pali commentaries ("Aṭṭhakathā") remain influential today. Both Abhidhamma and the Pali commentaries influenced the "Visuddhimagga," an important 5th-century text by the Theravada scholar Buddhaghosa, who also translated and compiled many of the "Aṭṭhakathās" from older Sinhalese sources.