Don’t you mean Byzantium?
Someday Russian Christians will take Constantinople and restore this great church for the greater glory of God the Father,God the Son and God the Holy Ghost. On that day, I pray the followers of Allah will toss away their prayer rugs and accept the forgiveness of Jesus Christ. I pray that I shall live to see that day.
Byzantium is the empire and Constantinople is its capital city.
“Istanbul” is how the Turks heard the phrase, “eis ten Poli”, “in the city”. It is not even a proper name, just a geographical fiction.