Saṃghabhadra

Saṃghabhadra's philosophical work was primarily an attempt to defend the orthodox doctrines of the Vaibhāṣika school from the attacks of its main opponents, the Sautrantikas, especially Vasubandhu who had written the Abhidharmakośabhasya as an exposition as well as a critique of many Vaibhāṣika doctrine. Saṃghabhadra is said to have spent 12 years composing the Nyāyānusāra (a commentary to Vasubandhu's verses) to refute Vasubandhu and other Sautrāntikas such as the elder Śrīlāta and his pupil Rāma.

According to Xuanzang's records, after composing his works, Saṃghabhadra sought out Vasubandhu in order to face him in public debate, but he died before he was able to do so.