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Kushan empire

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.

Around 260 CE, the armies of the Sasanid Emperor Shapur I launched an attack against Peshawar, and severely damaged Buddhist monuments and monasteries throughout the Valley of Peshawar. Shapur's campaign also resulted in damage to the city's monumental stupa and monastery. The Kushans were made subordinate to the Sasanids and their power rapidly dwindled, as the Sasanids blocked lucrative trade routes westward out of the city.

Kushan Emperor Kanishka III was able to temporarily reestablish control over the entire Valley of Peshawar after Shapur's invasion, but the city was then captured by the Central Asian Kidarite kingdom in the early 400s CE.