Faxian (Fahien), the Chinese Buddhist monk and traveler, visited India during the reign of Chandra Gupta II (Vikramaditya, c. 380-415 CE). His journey (399-414 CE) is documented in his travelogue 'A Record of Buddhist Kingdoms.' He spent several years at Pataliputra studying Buddhist texts. Ashoka, Harshavardhana, and Kanishka ruled in different centuries - Fahien visited during the Gupta period, not their reigns.