Theodosius II  Cistern  428 A.D.  There are several cisterns lurking underneath the modern city of Istanbul. They were built to store water in the event of  a siege. Since these columns and capitals are unfinished, they were made for this cistern, unlike Justinian's cistern of 530, which has spoils from prior constructions. The metal rings to keep the columns from splitting due to the weight of buildings above, are modern.

Close-up shows an intermediate stage of  the sculpting of a Theodosian corinthian capital.  Theodosian cistern photos: Roger W. Hayworth (Wiki)

 

Re-used capital in Justinian's Basilica Cistern c. 530 A.D., Constantinople   5th century capital  barely visible vestigial volutes (Wiki)

 

Church of the Acheiropoeitos, Thessalonika, circa 470 A.D. nave capital  St. John Studion  type  (double acanthus) (Krautheimer)

 
Collection of various capitals looted from Constantinople and installed on the facade of the Church of San Marcos in Venice. At first, just the small details change, then the overall shape, as the Classical Roman 4th century gradually morphs into the Byzantine 6th century.  

Church of the Theotokos, Mount Garizim,  484 A.D.   pilaster capital   Blacked in acanthus motif appears, notice the unusual number of leaves (Krautheimer)