Tradition, as mentioned above, connects the rise of the Mahayana with the reign of Kanishka. Materials for forming a picture of Indian life under his rule are not plentiful but it was clearly an age of fusion. His hereditary dominions were ample and he had no need to spend his reign in conquests, but he probably subdued Kashmir as well as Khotan, Yarkand and Kashgar.[187] Hostages from one of these states were sent to reside in India and all accounts agree that they were treated with generosity and that their sojourn improved the relations of Kanishka with the northern tribes. His capital was Purushapura or Peshawar, and the locality, like many other features of his reign, indicates a tendency to amalgamate India with Persia and Central Asia. It was embellished with masterpieces of Gandharan sculpture and its chief ornament was a great stûpa built by the king for the reception of the relics of the Buddha which he collected. This building is described by several Chinese pilgrims[188] and its proportions, though variously stated, were sufficient to render it celebrated in all the Buddhist world. It is said to have been several times burnt, and rebuilt, but so solid a structure can hardly have been totally destroyed by fire and the greater part of the monument discovered in 1908 probably dates from the time of Kanishka. The base is a square measuring 285 feet on each side, with massive towers at the corners, and on each of the four faces projections bearing staircases. The sides were ornamented with stucco figures of the Buddha and according to the Chinese pilgrims the super-structure was crowned with an iron pillar on which were set twenty-five gilded disks. Inside was found a metal casket, still containing the sacred bones, and bearing an inscription which presents two points of great interest. Firstly it mentions "Agiśala the overseer of works at Kanishka's vihâra," that is, probably Agesilaus, a foreigner in the king's service. Secondly it states that the casket was made "for the acceptance of the teachers of the Sarvâstivâdin sect,"[189] and the idea that Kanishka was the special patron of the Mahayana must be reconsidered in the light of this statement. Legends ascribe Kanishka's fervour for the Buddhist faith not to education but to conversion. His coinage, of which abundant specimens have been preserved, confirms this for it presents images of Greek, Persian, Indian and perhaps Babylonian deities showing how varied was the mythology which may have mingled with Gandharan Buddhism. The coins bearing figures of the Buddha are not numerous and, as he undoubtedly left behind him the reputation of a pious Buddhist, it is probable that they were struck late in his reign and represent his last religious phase.[190] Hsüan Chuang[191] repeats some legends which relate that he was originally anti-Buddhist, and that after his conversion he summoned a council and built a stupa.