Vasubandhu (婆藪槃豆 Pó-sǒu-pán-dòu; Chinese 天親 Tiān-qīn / 世親 Shì-qīn), the great Indian Yogācāra-school philosopher (4th–5th c. CE) and one of the most consequential Buddhist authors. Conventionally dated to the second half of the 4th century or first half of the 5th century. His authorship-corpus includes the Abhidharmakośa-bhāṣya (the foundational Abhidharma compendium of Sarvāstivāda doctrine), the Triṃśikā and Viṃśatikā (foundational Yogācāra-school Vijñaptimātra treatises), the Daśabhūmika-vyākhyāna (commentary on the Daśabhūmika, T1522), and the present Sukhāvatī-vyūhopadeśa (T1524). The much-debated “Two Vasubandhus” question (Frauwallner 1951, Skilling 1987, Boucher 1995) — whether one author wrote all attributed works or whether they are by two distinct Vasubandhus, an earlier Sarvāstivāda and a later Yogācāra — remains unresolved.
(Note: see also the existing person note 天親菩薩 / 世親菩薩 for the Chinese-tradition designation.)