Excerpts from Books and Wikipedia
"Within a year, both Theodosius II and Bahram had decided it would be more prudent to swear a truce instead. . . . Theodosius now had the luxury of actually ruling, instead of just fighting for survival. In 429, he appointed a commission to synthesize all the irregular and competing laws in his part of the empire into a single coherent law code, the Codex Theodosianus. He took credit for the new walls that now protected Constantinople, the Theodosian Walls. And he founded a school in Constantinople for the study of law, Latin, Greek, medicine, philosophy, and other advanced subjects—a school that would eventually gain the name “University of Constantinople,” making it one of the oldest universities in Europe." [Bauer: Medieval World, p. 87-9]