As Istanbul was the capital of the Ottoman Empire for almost 500 years, among the dominant types of architectural monuments the Ottomans built all around the city are the mosques, mosque complexes, smaller and neighborhood mosques, each one of which is an architectural masterpiece.
Construction of the first big "selatin" mosque complex in Istanbul, the Fatih Mosque, was begun in 1453. The mosques that were built by the sultans and their family members with more than one minaret were known as the "selatin" (royal) mosques.

In order to meet the immediate needs of the population for more mosques, some of the Byzantine churches and monasteries were used as mosques, after the conquerence. While the big mosques and mosque complexes were placed at the central points of the city, smaller complexes known as Vizier Mosques were built for relatives of the dynasty and top state officials.