Emperor Theodosius II marries Aelia Eudocia at Constantinople (Byzantine Empire).

Theodosius II, called "the Calligrapher", was Roman emperor from 402 to 450. He was proclaimed Augustus as an infant and ruled as the Eastern Empire's sole emperor after the death of his father Arcadius in 408. His reign was marked by the promulgation of the Theodosian law code and the construction of the Theodosian walls of Constantinople. He also presided over the outbreak of two great Christological controversies, Nestorianism and Eutychianism.

Aelia Eudocia Augusta, also called Saint Eudocia, was an Eastern Roman empress by marriage to Emperor Theodosius II. Daughter of an Athenian philosopher, she was also a poet, whose works include Homerocentones, or Homeric retellings of Biblical stories. After an estrangement with Theodosius, she permanently settled in Jerusalem, where she supported the local population.

Istanbul is the largest city in Turkey, constituting the country's economic, cultural, and historical heart. With a population over 15 million, it is home to 18% of the population of Turkey. Istanbul is among the largest cities in Europe and in the world by population. It is a city on two continents; about two-thirds of its population live in Europe and the rest in Asia. Istanbul straddles the Bosphorus—one of the world's busiest waterways—in northwestern Turkey, between the Sea of Marmara and the Black Sea. Its area of 5,461 square kilometers (2,109 sq mi) is coterminous with Istanbul Province.

The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman Empire in the 5th century AD, it endured until the fall of Constantinople to the Ottoman Empire in 1453. The term 'Byzantine Empire' was coined only after its demise; its citizens used the term 'Roman Empire' and called themselves 'Romans'.