In the first century of the Common era, Purushapura came under control of Kujula Kadphises, founder of the Kushan Empire. The city was made the empire's winter capital. 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. After his death, the magnificent Kanishka stupa was built in Peshawar to house Buddhist relics. The golden age of Kushan empire in Peshawar ended in 232 CE with the death of the last great Kushan king, Vasudeva I.