The Süleymaniye Mosque (Turkish: Süleymaniye Camii) is an Ottoman imperial mosque located on the second Hill of Istanbul, Turkey. It is the second largest mosque in the city, and one of the best-known sights of Istanbul.

History
The Süleymaniye Mosque was built on the order of Sultan Suleiman I (Suleiman the Magnificent) and was constructed by the great Ottoman architect Mimar Sinan. The construction work began in 1550 and the mosque was finished in 1557, opening on 16th August of that year.

Sinan considered the design to be an architectural counterpoint to the Byzantine Hagia Sophia. The Hagia Sophia, converted into a mosque under Mehmed II, served as a model to many Ottoman mosques in Istanbul. However, Sinan's Süleymaniye is a more symmetrical, rationalized and light-filled interpretation of earlier Ottoman precedents, as well as the Hagia Sophia. It is possible that dialogue between Italy and Istanbul contributed to Sinan's enthusiasm for symmetrical and rational forms, as promoted by writers like Alberti.

The design of the Süleymaniye also plays on Suleyman's self-conscious representation of himself as a 'second Solomon.' It references the Dome of the Rock, which was built on the site of the Temple of Solomon, as well as Justinian's boast upon the completion of the Hagia Sophia: "Solomon, I have surpassed thee!" The Süleymaniye, similar in magnificence to the preceding structures, asserts Suleyman's historical importance. The structure is nevertheless smaller in size than its older archetype, the Hagia Sophia.

The Süleymaniye was ravaged by a fire in 1660 and was restored by Sultan Mehmed IV. Part of the dome collapsed again during the earthquake of 1766. Subsequent repairs damaged what was left of the original decoration of Sinan (recent cleaning has shown that Sinan experimented first with blue, before turning red the dominant color of the dome).

During World War I the courtyard was used as a weapons depot and when some of the ammunition ignited the mosque suffered another fire. Not until 1956 was it fully restored again.

Exterior
View of the dome
Interior view of the domes
Interior of the SüleymaniyeAs with other imperial mosques in Istanbul, the mosque itself is preceded by a monumental courtyard (avlu) on its west side. The courtyard at the Süleymaniye is of exceptional grander with a colonnaded peristyle with columns of marble, granite and porphyry. At the four corners of the courtyard are the four minarets, a number only allowable to mosques endowed by a sultan (princes and princesses could construct two minarets; others only one). The minarets have a total of 10 galleries (serifes), which by tradition indicates that Suleiman I was the 10th Ottoman sultan.

The main dome is 53 meters high and has a diameter of 26.5 meters. At the time it was built, the dome was the highest in the Ottoman Empire, when measured from sea level, but still lower from its base and smaller in diameter than that of Hagia Sophia.

Interior
The interior of the mosque is almost a square, 59 meters in length and 58 meters in width, forming a single vast space. The dome is flanked by semi-domes, and to the north and south arches with tympana-filled windows, supported by enormous porphyry monoliths. Sinan made of a radical architectural innovation to mask the huge north-south buttresses needed to support these central piers. He incorporated the buttresses into the walls of the building, with half projecting inside and half projecting outside, and then hid the projections by building colonnaded galleries. There is a single gallery inside the structure, and a two-story gallery outside.

The interior decoration is subtle, with very restrained use of Iznik tiles. The white marble mihrab and mimbar are also simple in design, and woodwork is restrained, with simple designs in ivory and mother of pearl.