Several Buddhist theologians are associated with Kanishka Ashvaghosha, Vasumitra, Parshva, Sangaraksha, Dharmatrata and Matricheta. Nagarjuna was the great exponent of Mahayana doctrine. Charaka, the most celebrated authority on Ayurveda was the court physician of Kanishka, and Mathara a politician of rare merit, was his Minister. Kanishka is traditionally believed to have died fighting in central Asia.