Theodosius II, 401–50, Roman emperor of the East (408–50), son and successor of Arcadius. He preferred the study of theology and astronomy to public affairs, which he left to the guidance of his sister, Pulcheria Pulcheria (pəlkēr`ēə), 399–453, Roman empress of the East (414–53), daughter of Arcadius and Eudoxia.
..... Click the link for more information. —and, at times, to that of his wife Eudocia Eudocia (y

dō`shə), d.
..... Click the link for more information. . The chief political events of his reign were the establishment (425) of Valentinian III Valentinian III, 419–55, Roman emperor of the West (425–55). Two years after the death of his uncle, Honorius , he was placed on the throne by his cousin Theodosius II, who deposed the usurper John.
..... Click the link for more information. as emperor in the West, the raids into the empire by the Huns under Attila Attila (ətĭl`ə, ăt`ələ), d. 453, king of the Huns (445–53).
..... Click the link for more information. , and the conferences held with Attila in regard to the ever-increasing tribute he demanded. In 431, Theodosius summoned the Council of Ephesus, which condemned Nestorianism Nestorianism, Christian heresy that held Jesus to be two distinct persons, closely and inseparably united. In 428, Emperor Theodosius II named an abbot of Antioch, Nestorius (d. 451?), as patriarch of Constantinople.
..... Click the link for more information. , and in 449 he convoked and upheld the Robber Synod, which declared the orthodoxy of Eutychianism (see Eutyches Eutyches (y

`tĭkēs), c.378–c.
..... Click the link for more information. ). Among his other activities were the founding (425) of the higher school (or university) of Constantinople and the publication (438) of the Theodosian Code Theodosian Code (thē'ədō`shən), Latin Codex Theodosianus,
..... Click the link for more information. . His brother-in-law, Marcian, succeeded him.

Theodosius II

(born April 10, 401, Constantinople—died July 28, 450) Eastern Roman emperor (408–450). In 402 he was made coemperor with his father, Arcadius (son of Theodosius I), then became sole ruler of the East at age seven, initially under a regency. A gentle, scholarly man, he allowed relatives and ministers to dominate his government. His generals twice repelled the Persians (422, 447) but failed to evict the Vandals from Roman Africa (429) and to prevent Attila's invasions (441–443, 447). The Nestorian heresy caused internal upheaval. Theodosius was credited with building the wall around Constantinople (413), founding the University of Constantinople (425), and promulgating the Theodosian Code (438).