This church is the earliest basilica in Istanbul and predates Hagia Sophia.  Built in 463 AD, the church had traditional aisles, nave and apse.  The roof didn’t survive at all as shown on the sketch.  There were marble carvings on the classical capital of the column we observed.  The capital seemed to be a dilution of the capitals in classical times.  The base is not eastern, but a simulation of a western base.

On the same day, we went to Mihrimah Mosque.