File:Keystone Constantine Forum Istanbul.JPG
- 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.