Obelisk of Theodosius in Istanbul - Theodosius (346-395) was the last emperor of united Roman Empire, who brougt the ancient Egyptian Obelisk by the sea transport from Egypt and placed it at the hippodrome in Constantinople (now Istanbul), while Egypt was a part of Roman Empire. He took the control of the eastern empire and ended the war with the Visigoths, became a Christian and in 391 banned all forms of pagan worship.
Theodosius - The Obelisk of Theodosius (Turkish: Dikilitaş) is the Ancient Egyptian obelisk of Pharaoh Tutmoses III (1479–1425 BC). Roman emperor Constantius II (337-361 AD) had it and another obelisk transported to Alexandria. The other obelisk is today known as the Lateran obelisk, whilst the obelisk that would become the obelisk of Theodosius was transported to Constantinople by Theodosius I (378-392 AD). http://en.wikipedia.org/wiki/Obelisk_of_Theodosius