Dignaga
Dignāga (circa 6th century AD) was one of the six great commentators (the ‘Six Ornaments’) on the Buddha’s teachings.
He was one of the four great disciples of the Second Buddha, Vasubandhu, and excelled his teacher in the sphere of logic (pramāṇa).
His early (extant) works were:
- The Abhidharmakoša-marma-pradīpa - a condensed summary of Vasubandhu's seminal work
- A brief summary of the Aṣṭa-sāhasrika-prajñā-pāramitā-sūtra
His remaining works were all pertaining to logic:
- Ālambana-parīkṣā
- Trikāla-parikṣa
- Hetu-cakra-samarthana
- Nyāyamukha
- Pramāṇa-samuccaya, which was a condensation of all these works
His reputation as unequalled in debate was cemented through his celebrated victory over the bramhin named Sudurjaya at Nālandā monastery.
Among his disciples was Išvarasena, who later became the teacher of Dharmakīrti.
Source: Buddhist Logic Volume 1 - TH. Stcherbatsky: p30