Dharmakīrti

Dharmakīrti is the greatest of the Buddhist epistemologists, active in roughly the 6th–7th century CE, whose Pramāṇavārttika ('Commentary on Valid Cognition')—nominally a commentary on Dignāga—became one of the most studied works of Indian philosophy. He sharpened the analysis of perception and inference, the theory of momentariness, and the apoha account of meaning, and his thought remains a core curriculum in Tibetan monastic education. He is securely historical; his exact dates rest on tradition.