<span>the Ottoman Empire.. Hope this helps</span>
On May 29, 1453, after an Ottoman army stormed Constantinople, Mehmed triumphantly entered the Hagia Sophia, which would become the city's leading mosque. Emperor Constantine XI died in battle that day, and the decline and fall of the Byzantine Empire was complete.
Defenders of the faith have been raised up in every era of the Church to proclaim fidelity to the truth by their words and deeds. Some have fought heresy and overcome confusion like Athanasius against the Arians and Ignatius Loyola in response to the Protestant reformers. Others have shed their blood for the faith, like the early Christian martyrs of Rome, or Thomas More, John Fisher and Edmund Campion in Reformation England.