 The Kushan's summer capital at "Kapisi" (modern Bagram, Afghanistan) was seen as the secondary capital of the empire, while Puruṣapura was considered to be the empire's primary capital.Ancient Peshawar's population was estimated to be 120,000, which would make it the seventh-most populous city in the world at the time.As a devout Buddhist, the emperor built the grand "Kanishka Mahavihara" monastery.