DescriptionKeystone Constantine Forum Istanbul.JPG
English: This huge key stone which was found in Çemberlitaş may belong to a big arch at the Forum of Constantine. The forum was built by Constantine I in the quarter of today's Çemberlitaş. It was oriented north-south, the forum was oval in its ground plan. Historical sources report that located within the forum was:
- a Senate House or basilica, a monumental fountain or nymphaeum, and silversmith and chandler shops.
The pavement was of marble. On the periphery it was ornamented by statuary and reliefs. An honourific column dedicated to Constantine I was erected in its centre. A place of worship devoted to the emperors, known as Hagios Constantinos, was constructed on the rectangular base of the monument. One of the official imperial ceremonies was held here. Basil I the Macedonian constructed the Church of St. Mary (Theotokos) on one of the porticoes.
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{{Information |Description={{en|This huge key stone which was found in Çemberlitaş may belong to a big arch at the '''Forum of Constantine'''. The forum was built by Constantine I in the quarter of today's Çemberlitaş. It was oriented north-south, the