The Belisarius Tower in the city of Constantinopolis, which is describedwith contradictory statements by contemporary architectural historians,cannot be localized or identifi ed. More precisely, this tower is assumed tobe a bastion attached to the Marmara sea fortifi cations.This paper, which is based on a wider research on the engravings andmaps, intends to show that this tower wasn’t a bastion attached to theMarmara sea fortifi cations, but an independent tower rising out of the sea.