Kanishka I (Sanskrit: कनिष्क, ; Greco-Bactrian: Κανηϸκε Kanēške; Kharosthi: 𐨐𐨞𐨁𐨮𐨿𐨐 ; Brahmi: ), or Kanishka, was an emperor of the Kushan dynasty, under whose reign (c. 127–150 CE) the empire reached its zenith. He is famous for his military, political, and spiritual achievements. A descendant of Kujula Kadphises, founder of the Kushan empire, Kanishka came to rule an empire extending from Central Asia and Gandhara to Pataliputra on the Gangetic plain. The main capital of his empire was located at Puruṣapura (Peshawar) in Gandhara, with another major capital at Mathura. Coins of Kanishka were found in Tripuri (present-day Jabalpur). His conquests and patronage of Buddhism played an important role in the development of the Silk Road, and in the transmission of Mahayana Buddhism from Gandhara across the Karakoram range to China. Around 127 CE, he replaced Greek with Bactrian as the official language of administration in the empire. Earlier scholars believed that Kanishka ascended the Kushan throne in 78 CE, and that this date was used as the beginning of the Saka calendar era. However, historians no longer regard this date as that of Kanishka's accession. Falk estimates that Kanishka came to the throne in 127 CE. Genealogy There are two theories about Kanisha's origins, both based on the supposition of a separate Kanishka dynasty. The earlier Sten Konow's is that Kanishka came from Khotan, having been summoned as an ethnic ally at the time of troubles after Vima's reign. Konow supports this theory by citing a Tibetan tradition that a Khotanese expedition to India of about A.D. 120 was commanded by a King Vijayakirti along with a King Kanika and the king of Guzan. Roman Ghirshman's similar theory is that Kanishka was originally king of Kashmir before becoming suzerain of the dynasty as a whole. He cites the above mentioned Khalatse epigraph, which may allude to Kushan power reaching the northeast corner of Kashmir, and also the Rajatarangini, in which the list of Turushka kings of Kashmir gave Kanishka's name as the third of a sequence, along with the names of Hushka and Jushka. Finally, testimony of Kanishka's activity in Kashmir in favor of the Buddhist faith suggests that he favored the region above others and that he founded Peshawar as his capital to be close to Kashmir. He was of Yuezhi ethnicity and his native language was probably Tocharian. Kanishka was the successor of Vima Kadphises, as demonstrated