 A small domed structure, the Conqueror’s Mosque, appears as the focal point of the fortress courtyard, which also marks the midpoint of the axis of symmetry (Gabriel).Yedikule Fortress was frequently used as a state prison, and ambassadors of states currently at war with the Ottoman Porte were usually imprisoned within its walls.The fortress also housed prisoners who were victims of palace intrigue and infighting, as well as political opponents of the imperial court.