Cardo and decumanus: Streets crossing at right angles in the Roman and Byzantine cities.
Chancel screen: A low parapet enclosing the sanctuary inside a church; it was usually made of stone or marble posts and panels.
Ciborium: A free-standing domed construction rised as a canopy over the Holy Altar and supported by four thin columns.
Coenobium (Koinobion): A monastery in which monks live and work together.
Constantine I, the Great: Augustus and sole ruler of the Roman Empire from 324, till his death in 337. In the dommestic policy he carried out importand military, administrative and fiscal reforms. He founded Constantinople, in the site of the old Megarian colony Byzantis, as the new imperial residence and a monument for his victory over augustus and co-ruler Licinius, in 324. He was the first christian emperor, as he was baptised on his deathbed.
Constantius II: Son of Constantine I the Great, caesar, augustus and sole emperor of the empire from 353. He faced succesfully the raids of the Persians in Mesopotamia and the expansion of the Germans and Sarmatians in northern borders. Constantius was in fond of Arianism, thus his religious policy caused a lot of conflicts between state and Church.
Consuls: Annualy appointed officials (one in Constantinople and one in Rome) responsible for financing public games in the hippodrome or circus; consular diptychs were carved ivory diptychs in the form of writing-tablets, distributed as gifts by consuls when they took office.
Crypt: A chamber beneath the main floor of the church, usually containing graves or relics.