praefectus urbi (prefect of the city)
(later referred to as the eparch of the city) Αdministrator and virtual governor of Constantinople in the Early/Middle Byzantine Era. He was responsible for the surveillance and the harmonius life of the Capital. One of his responsibilities was to control the commercial and manufacturing activities of Constantinople. After 1204, however, the office began to diminish, while from the 14th century, his responsibilities were assumed by two officers, the so-called kephalatikeuontai of the capital.

praetorian prefect (praefectus praetorio)
Commander of the emperor's bodyguard under the principate. During the regne of Constantine I the praetorian prefect becomes a dignitary responsible for the administrative unit called the prefecture, which was subdivided into dioceses. In 400 A.D. there were four such praetorian prefectures, of Oriens, of Illyricum, of Illyricum, Italia and Africa and of Gallia. The praetorian prefects were second only to the emperor. The praetorian prefect of Oriens was the mightiest among prefects. His office is for the last time mentioned in 680.

Second Ecumenical Council (Constantinople, 381)
The Second Oecumenical Council assembled at Constantinople in 381 in order to discountenance the ideas of Macedonios, who challenged the divine nature of the holy spirit, and to condemn the hersy of apollinarism, which referred to the nature of Jesus Christ. This council appended the clauses pertaining to the holy spitrit to the Nicene Creed.

sella curulis (lat.)
The throne of the Roman Emperor. Tradition attributes it to Romulus. It was a seat without a back, with crossed-S-shaped feet.

Tyche (Fortuna)
A symbol of wealth and prosperity, Tyche was considered a deity in the Graeco-roman world (it latin version being Fortuna) and it was often associated with certain cities, as an expression of their power and success. Its iconogrpaphic expression was a personification of the city in the form of a goddess of great importance for this particular city.