Theodosius II was the Byzantine emperor who governed the Eastern Roman Empire from 402 until his death in 450. Born in Constantinople in 401, he was named Augustus when he was only nine months old. Following the death of his father, Arcadius, he became the sole ruler of the East in 408. Known as the Calligrapher, his reign was marked by significant legal, educational, and military developments, including the establishment of the University of Constantinople and the commissioning of the Codex Theodosianus.