The Laleli Mosque is an 18th-century Ottoman imperial mosque in Istanbul, Turkey. The mosque was commissioned by Sultan Mustafa III to serve as his imperial or sultanic mosque. Construction began in 1760 and was completed in 1764. The mosque was built in the Ottoman Baroque style of its time.
The mosque was the centerpiece of a larger complex (külliye) that included the Mustafa III's tomb, a nearby caravanserai which provided some revenues to the complex, a sebil, and a madrasa. The mosque and its complex were damaged by the 1766 earthquake and it was fully restored in 1783. The restoration preserved the original mosque's appearance. The mausoleum's façade was updated with new marble window frames in the early 19th century.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.