The Prophet predicted the conquest of Istanbul


13. Again, according to an authentic narration, the Prophet, upon him be peace and blessings, declared:


Surely, Constantinople (Istanbul) will be conquered (by my community); how blessed the commander who will conquer it, and how blessed his army.


He thus foretold the conquest of Istanbul by Muslims, and indicated the high spiritual rank of Sultan Mehmed, the Conqueror, and the virtuousness of his army. What he foretold took place centuries later.

Once Sultan Mehmad opened up Istanbul [in turkey] - he established so much justice there and removed the oppression of the Byzantinian Romans. This was done in 1453, yet the Prophecy was made around 800 years before this by God's final Messenger, Muhammad (peace be upon him.)