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The Forum of Theodosius (Greek: φόρος Θεοδοσίου, today Beyazıt Square) was an area in Constantinople. It was originally built by Constantine I and named the Forum Tauri ("Forum of the Bull"). In 393, however, it was renamed after Emperor Theodosius I, who rebuilt it after the model of Trajan's Forum in Rome, surrounded by civic buildings such as churches and baths and decorated with porticoes as well as a triumphal column at its center.
A marble triumphal arch was erected on the west side of the Forum, out of marble from Marmara Island. The triumphal arch had a vaulted roof with three passageways. The central archway of the three was wider and higher than the others and flanked by four-column piers carved in the form of Herculean clubs grasped by a fist. Built to mimic triumphal arches in Rome itself, on top was a central statue of Theodosius flanked by statues of his sons Arcadius and Honorius.
Today the main street beginning in Hagia Sophia Square runs to the west along basically the same route as the ancient Mese road, which formed the main artery of the old city. The Mese, passing through Theodosius's triumphal arch, continued on to Thrace and as far as the Balkan peninsula. The triumphal arch and the ancient buildings around it (to which surviving ruins in the area possibly belong) were destroyed as a result of invasions, earthquakes (the central arch and the statue of Arcadius collapsed already in 558; the rest of the arch was destroyed by another earthquake in 740) and other natural disasters from the 5th century onwards, and so were completely destroyed long before the Ottoman Turks took the city in 1453.
I here show some pictures of the remains. On one we see an area that seems to be prepared to hold a park, in it some remains that may be from the same arch. Maybe the authorities even plan to do some reconstructing there?