 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.