If we look at the historical Greek column types in the basilica, we will see mainly Doric and Corinthian structures. We know that especially the Corinthian columns come from the Ancient City of Ephesus, located in the Aegean region, very close to Istanbul. In addition, it would be correct to say that the Doric structures came from the temples of Apoyo and Hieropolis. The most basic rule to distinguish Corinthian and Doric structures is that the top of the Corinthian column is very ornate and eye-catching. The Doric structure, on the other hand, has a very basic design with column heads.