Fetihkapı (The Gate of Saint Romanus) holds remarkable historical significance. Geographically, the gate is located near the peak of the Seventh Hill, at an elevation of approximately 68 meters. The Byzantines built a church dedicated to Saint Romanus in the 9th century, which was later rebuilt in the 19th century under the name St. Nicholas (Hagios Nikolaos).Today, locals refer to it as Cannon Gate (Topkapı) because Sultan Mehmed II conquered the city by entering through this gate, utilizing state-of-the-art cannons. On the right side of the wall, there is a Turkish inscription quoting the Prophet Muhammad’s hadith:“Verily, Constantinople shall be conquered. Blessed is the commander who conquers it, and blessed is the army that will achieve it.”Below this section, it is written that on the morning of 29 May 1453, the army of Fatih Sultan Mehmed (Mehmed II, the Conqueror) entered the city through this very gate after a breach opened by the cannons.