Church of St. Theodosia

I found this twelfth century Hexagram picture on Les Eglises de Constantinople, Jean Ebersolt, Adolphe Thiers. Paris, 1913

Since the byzantine name of this former church has not been established with certainty, we use the turkish name here. It has been identified with the churches of Saint Euphemia, Saint Theodosia and that of the Euergetis Monastery. The church is a construction of the twelfth century which stands elevated on an artificial terrace and appearently does not replace an old predecessor. It lay partly in ruins after the ottoman conquest and had to be restored heavily when it was rebuilt as a mosque