Task: Text Categorization
Input (English): This city was formerly home to the Monastery of Gastia, which has now been converted for other purposes, but it is still home to the Monastery of Stoudios. One church in this city was founded by St. Pulcheria. This city contains two churches operated by the Bulgarian Orthodox Church: one named for St. Demetrius, and another made out of cast iron and named for St. Stephen. A 13th century church here is named St. Mary of the Mongols because it was founded by a local princess who had married a Mongol prince from the Ilkhanate before being tragically widowed. The Three Chapters controversy was adjudicated by a council at this city, and Nestorianism was condemned by another council here, and Anastasius was a Patriarch of this city who played a crucial role in one of its largest religious scandals. For ten points, name this city home to Iconoclasm and to the Hagia Sophia.
Output (English): Social Science