Yazdgird I King of Sasanian Empire 
- Marriage: Sashandukht Galutha 
- Died: 420
Another name for Yazdgird was Isdegerd Yazdigerd Yazdegerd.
Yazdgird I, the Wicked , was so called because of his conflict with the Zoroastrian priesthood. The persecution of Christians and Jews ended for a time. Under the patronage of Yazdgird, Sassanian Christians held the Council of Seleucia and adopted the anti-Arian creed of the Council of Nicaea. Near the end of Yazdgird's reign, toleration ceased when Christians began burning down Zoroastrian fire temples. In 409 Yazdgird struck a treaty with Rome and his rule was peaceful. He was succeeded by his son Bahram V.
After his death, the nobles refused to let any of Yazdagird's sons succeed him. But one of them, Bahram, had the support of al-Mundhir, the pro-Persian prince of the Arab Lakhmid kingdom, as well as help from Mihr-Narseh, Yazdagird's last prime minister, and that gained him the throne. As King Bahram V (420-438), nicknamed Gur (Wild Ass), he became the most popular of all Sassanid rulers, winning renown as a hunter, poet, lover and musician. He was a favorite subject in Persian art and literature for centuries, even after the fall of the empire. Early in his reign the persecution of Christians angered the Romans and brought on a short war (421-422), which ended with a few minor Roman victories in Mesopotamia. In the treaty that followed the West agreed to tolerate Zoroastrianism and the East Christianity. The religious reason for waging war was about to disappear anyhow, since the recently excommunicated Nestorians were quite willing to form an Iranian Christian Church with no political ties to the West. In Central Asia Bahram was more successful, driving off the latest incursion of Huns.
Yazdegerd I, or Izdekerti ("made by God" Izdigerdes) (in modern Persian : ), was the thirteenth Sassanid king of Persia and ruled from 399 to 421. He is believed by some to be the son of Shapur III (383\endash 388) and by others to be son of Bahram IV (388\endash 389). He succeeded to the Persian throne on the assassination of Bahram IV in 399 and ruled for twenty-one years till his death in 421.
Yazdegerd I's reign is largely uneventful. The king is described as being of a peaceful disposition. There were cordial relations between Persia and the Eastern Roman Empire as well as between Persia and the Western Roman Empire . Early during his reign, Yazdegerd was entrusted the care of the Roman prince Theodosius by his father Arcadius on the latter's death in 408, and Yazdegerd faithfully defended the life, power and possessions of the Roman prince.
Yazdegerd promoted Christianity in the early years of his reign and later opposed it. His alternate persecution of Zoroastrians and later Christians earned him the epithets of Al Khasha or "the Harsh" and Al Athim or "the Wicked" and Yazdegerd the Sinner. However, his general disposition towards the citizens of the Persian Empire was good. They gave him the epithet of Ramashtras or "the most quiet".
The later part of his reign was occupied by his attempts to convert Armenia to Zoroastrianism. During his last days, there took place a civil war between his sons. Bahram V emerged victorious and claimed the throne. Yazdegerd I died in 421 and was succeeded by his son Bahram V or Bahramgur.
War of succession
When Yazdegerd I was overcome by mortal illness in the year 419, Shapur immediately rushed to Ctesiphon to claim the Sassanian throne leaving behind a viceroy to govern Armenia. But the viceroy-designate was killed soon after Shapur left Armenia. A battle of succession followed and lasted for three years after Yazdegerd's death. Shapur was treacherously killed by the courtiers in the initial stages of the battle. Bahram V arrived from Hira and captured the throne after defeating the Persian nobles with an Arab army in a three-year-long battle. Narseh, another son of Yazdegerd I was appointed governor of Khorasan .
1. ^ Nöldeke, p. 73 n. 3
2. ^ a b c d e Rawlinson 1882, p.275.
3. ^ Arabic al-atňim, Tabari I, p. 847
4. ^ a b c Rawlinson 1882, p.272.
Yazdgird married Sashandukht Galutha  [MRIN: 551616970], daughter of Rash Galutha  and Unknown.