 Late in Yazdegerd's reign, the powerful Parthian House of Suren became powerful associates of the shah and played a key role in the affairs of the empire.The authority of the Suren family flourished until the end of the reign of Yazdegerd's grandson, Yazdegerd II ().During Yazdegerd I's rule, his western neighbours in the Eastern Roman Empire were in turmoil; the Ostrogoths were raiding the Balkans, the Franks had begun a rebellion, a civil war was raging, and the eastern provinces were rioting.