Gate of St. Romanus, Istanbul

The Gate of Saint Romanus (Porta Agiou Rōmanou) holds a significant place in the history of Istanbul, particularly during the era of Constantinople. This historic gateway, now colloquially referred to as Cannon Gate, is famed for its role during the last siege of Constantinople. Its modern name, "Cannon Gate," is derived from the placement of the great cannon, the "Basilic," by the defending forces opposite the gate in a desperate attempt to fend off attackers.

Positioned strategically along the land walls of Constantinople, the Gate of Saint Romanus was named after a nearby church, embodying the rich religious and cultural history of the area. During the critical moments leading up to the fall of Constantinople, Emperor Constantine XI established his command post here, marking the gate as the central and most threatened stretch of the city's fortifications.

The Gate of Saint Romanus also served as a pivotal entrance point for the Ottoman forces led by Mehmed II during the historic conquest of Constantinople in 1453. This event marked a significant turning point in the city's history, transitioning from Byzantine to Ottoman rule.

Geographically, the gate is situated near the peak of the Seventh Hill of Istanbul, approximately 68 meters above sea level. The land walls then descend into the valley of the Lycus River, reaching their lowest elevation at 35 meters, before climbing the slope of the Sixth Hill. It is here that the walls rise again towards the Gate of Charisius (or Gate of Adrianople), standing at about 76 meters in height. The wall rises and falls as it approaches the Blachernae section, ending at the coastal plain by the Golden Horn and the renowned Prisons of Anemas.