Theodosius II in the context of "Council of Ephesus"

The ancient Olympic Games (Ancient Greek: τὰ Ὀλύμπια, ta Olympia), or the ancient Olympics, were a series of athletic competitions among representatives of city-states and one of the Panhellenic Games of ancient Greece. They were held at the Panhellenic religious sanctuary of Olympia, in honor of Zeus, and the Greeks gave them a mythological origin. The originating Olympic Games are traditionally dated to 776 BC. The games were held every four years, or Olympiad, which became a unit of time in historical chronologies. These Olympiads were referred to based on the winner of their stadion sprint, e.g., "the third year of the eighteenth Olympiad when Ladas of Argos won the stadion". They continued to be celebrated when Greece came under Roman rule in the 2nd century BC. Their last recorded celebration was in AD 393, under the emperor Theodosius I, but archaeological evidence indicates that some games were still held after this date. The games likely came to an end under Theodosius II, possibly in connection with a fire that burned down the temple of the Olympian Zeus during his reign.

During the celebration of the games, the Olympic truce (ekecheiría) was announced so that athletes and religious pilgrims could travel from their cities to the games in safety. The prizes for the victors were olive leaf wreaths or crowns. The games became a political tool used by city-states to assert dominance over their rival city-states. Politicians would announce political alliances at the games, and in times of war, priests would offer sacrifices to the gods for victory. The games were also used to help spread Hellenistic culture throughout the Mediterranean. The Olympics also featured religious celebrations. The statue of Zeus at Olympia was counted as one of the seven wonders of the ancient world. Sculptors and poets would congregate each Olympiad to display their works of art to would-be patrons.

The Imperial University of Constantinople, sometimes known as the University of the Palace Hall of Magnaura (Greek: Πανδιδακτήριον τῆς Μαγναύρας), was an Eastern Roman educational institution that could trace its corporate origins to 425 AD, when the emperor Theodosius II founded the Pandidacterium (Medieval Greek: Πανδιδακτήριον).

The Pandidakterion was restructured in 1046 by Constantine IX Monomachos who created the Departments of Law (Διδασκαλεῖον τῶν Νόμων) and Philosophy (Γυμνάσιον).

In the 5th century in Christianity, there were many developments which led to further fracturing of the State church of the Roman Empire. Emperor Theodosius II called two synods in Ephesus, one in 431 and one in 449, that addressed the teachings of Patriarch of Constantinople Nestorius and similar teachings. Nestorius had taught that Christ's divine and human nature were distinct persons, and hence Mary was the mother of Christ but not the mother of God. The Council rejected Nestorius' view causing many churches, centered on the School of Edessa, to a Nestorian break with the imperial church. Persecuted within the Roman Empire, many Nestorians fled to Persia and joined the Sassanid Church (the future Church of the East) thereby making it a center of Nestorianism. By the end of the 5th century, the global Christian population was estimated at 10-11 million. In 451 the Council of Chalcedon was held to clarify the issue further. The council ultimately stated that Christ's divine and human nature were separate but both part of a single entity, a viewpoint rejected by many churches who called themselves miaphysites. The resulting schism created a communion of churches, including the Armenian, Syrian, and Egyptian churches, that is today known as Oriental Orthodoxy. In spite of these schisms, however, the imperial church still came to represent the majority of Christians within the Roman Empire.

At the end of the 4th century the Roman Empire had effectively split into two states although its economy and the Church were still strongly tied. The two halves of the empire had always had cultural differences, in particular exemplified by the widespread use of the Greek language in the Eastern Empire and the more limited use of Greek in the West (Greek was used in the West but Latin was displacing it as the spoken vernacular. By the 5th century scholars in the West had begun to abandon Greek in favor of the use of Latin. The Church in Rome, in particular, began to encourage the use of Latin in the western provinces and published Jerome's Vulgate, the first authorized translation of the Bible in Latin.

A Hodegetria, or Virgin Hodegetria, is an iconographic depiction of the Theotokos (Virgin Mary) holding the Child Jesus at her side while pointing to him as the source of salvation for mankind. The Virgin's head usually inclines towards the child, who raises his hand in a blessing gesture. Metals are often used to draw attention to young Christ, reflecting light and shining in a way to embody divinity. In the Western Church this type of icon is sometimes called Our Lady of the Way.

The most venerated icon of the Hodegetria type, regarded as the original, was displayed in the Monastery of the Panaghia Hodegetria in Constantinople, which was built specially to contain it. The painting became known as the Madonna of Constantinople. Unlike most later copies it showed the Theotokos standing full-length. It was said to have been brought back from the Holy Land by Eudocia, the wife of emperor Theodosius II (408–450), and to have been painted by Saint Luke the evangelist, the attributed author of the Gospel of Luke. The icon was double-sided, with a crucifixion on the other side, and was "perhaps the most prominent cult object in Byzantium".

The solidus (Latin 'solid'; pl.: solidi) or nomisma (Greek: νόμισμα, romanized: nómisma, lit. 'coin') was a highly pure gold coin issued in the Later Roman Empire and Byzantine Empire. It was introduced in the early 4th century, replacing the aureus, and its weight of about 4.45 grams remained relatively constant for seven centuries.

In the Byzantine Empire, the solidus or nomisma remained a highly pure gold coin until the 11th century, when several Byzantine emperors began to strike the coin with less and less gold. The nomisma was finally abolished by Alexios I Komnenos in 1092, who replaced it with the hyperpyron, which also came to be known as a "bezant". The Byzantine solidus also inspired the zolotnik in the Kievan Rus' and the originally slightly less pure gold dinar first issued by the Umayyad Caliphate beginning in 697.

Aelia Eudoxia (/ˈiːliə juˈdɒkʃə -ˈdɒksiə/; Ancient Greek: Αἰλία Εὐδοξία; died 6 October 404) was Eastern Roman empress by marriage to the Roman emperor Arcadius. The marriage was arranged by Eutropius, one of the eunuch court officials, who was attempting to expand his influence. As Empress, she came into conflict with John Chrysostom, the Patriarch of Constantinople, who denounced imperial and clerical excess. She had five children, four of whom survived to adulthood, including her only son and future emperor Theodosius II, but she had two additional pregnancies that ended in either miscarriages or stillbirths and she died as a result of the latter one.

Flavius Ardabur Aspar (Greek: Ἄσπαρ, fl. 400 – 471) was an Eastern Roman patrician and magister militum ("master of soldiers") of Alanic-Gothic descent. As the general of a Germanic army in Roman service, Aspar exerted great influence on the Eastern Roman Emperors for half a century, from the 420s to his death in 471, through the reigns of Theodosius II, Marcian and Leo I, who, in the end, had him killed. His death led to the ending of the Germanic domination of Eastern Roman policy.