For instance, necessary early church buildings are found in Rome , and in Thessaloniki . The earliest surviving church in Constantinople is the Basilica of St. John on the Stoudios Monastery, built within the fifth century. Constantine devoted great effort to the decoration of Constantinople, adorning its public spaces with historical statuary, and constructing a discussion board dominated by a porphyry column that carried a statue of himself. Major Constantinopolitan church buildings constructed under Constantine and his son, Constantius II, included the unique foundations of Hagia Sophia and the Church of the Holy Apostles.

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