This event was supposedly portended when an icon of the Virgin Mary fell of
This event was supposedly portended when an icon of the Virgin Mary fell off of a platform. It was described by the Venetian Nicolo Barbaro, and in the lead-up to it, 75 prisoners were impaled, followed by an offer for the defenders to surrender. The military leader Giovanni Giustiniani was fatally wounded during this event, which took 40 days to accomplish and was achieved by use of a gate in the northwestern wall, the Kerkoporta. After this event, the winning force was allowed three days in which to loot, and the Hagia Sophia was claimed for Muslim use. For 10 points, name this event, in which Mehmet II overtook the capital city of the Byzantine Empire in 1453.
This event was supposedly portended when an icon of the Virgin Mary fell off of a platform.
Fall of {Constantinople} [or {Ottoman Sack} of {Constantinople}, accept reasonable equivalents]