The Nuruosmaniye Mosque () is an 18th-century Ottoman mosque located in the Çemberlitaş neighbourhood of Fatih district in Istanbul, Turkey, which was inscribed in the Tentative list of World Heritage Sites in Turkey in 2016. Designed by a Greek architect named Simeon, the Nuruosmaniye mosque was the first monumental Ottoman building to exemplify the new Ottoman baroque style, which introduced baroque and neoclassical elements from Europe. The mosque's ornamentation and its curved courtyard display its baroque influences. The dome of the mosque is the fourth largest in Istanbul, behind the Hagia Sophia, Süleymaniye Mosque, and Fatih Mosque, respectively. The Nuruosmaniye mosque is part of a larger religious complex, or külliye, acting as a centre of culture, religion, and education for the neighborhood. The mosque is located on Istanbul's second hill, site of the mosque of Fatma Huton; that mosque was burned due to a fire. In Constantinople, the area of the Nurosmaniye Mosque was close to the Forum of Constantine, where the Column of Constantine () still stands. Surrounding the mosque is Istanbul's Grand Bazaar (). After the construction of the Sultan Ahmed Mosque, the Nurosmaniye mosque was the first imperial mosque to be built in 100 years. Architecture The Nuruosmaniye Mosque was designed by a Greek architect named Simeon. It was the first monumental Ottoman building to exemplify the new baroque style introduced from Europe during the Tulip Period of the Ottoman Empire. This style was the Ottoman Baroque style. It helped reshape the city of Istanbul by using a newer architecture style, moving it away from Ottoman Classical architecture. It was one the first monuments to use this style that was heavily influenced by European models. It was commissioned from the order of Sultan Mahmud I in 1748 and completed under his brother and successor Sultan Osman III in 1755. It was named Nuruosmaniye Mosque, meaning "The light of Osman", after Osman III, but also because of the 174 windows which illuminate the mosque's hall.The prayer hall is covered by a single dome 25 metres (82 feet) in diameter and 43.50 meters (142.7 feet) high above the floor level. The mosque utilizes a system of iron bracing running up from the floor, through the walls, and to the ceiling of the dome. The mosque material is made out of cut stone and marble. The general form of the building is described best as "straining everywhere to melt straight