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330 CE
340 CE
350 CE
360 CE
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330 CE: Constantinople is founded on the site of old Byzantium as "the new Rome."
331 CE: The Great Palace of Constantinople is first built by Constantine I.
360 CE: First Hagia Sophia built in Constantinople.
410 CE - 413 CE: The Theodosian Walls are built to better protect Constantinople.
532 CE - 537 CE: Hagia Sophia is built anew in Constantinople.
994 CE: Trdat the Architect completes his reconstruction of the dome of Hagia Sophia, Constantinople.