Thatta is a city in the Pakistani province of Sindh. Thatta was the medieval capital of Sindh, and served as the seat of power for three successive dynasties. Its construction was ordered by Jam Nizamuddin II in 1495. Thatta's historic significance has yielded several monuments in and around the city. Thatta's Makli Necropolis, a UNESCO World Heritage Site, is site of one of the world's largest cemeteries and has numerous monumental tombs built between the 14th and 18th centuries designed in a syncretic funerary style characteristic of lower Sindh. The city's 17th century Shah Jahan Mosque is richly embellished with decorative tiles, and is considered to have the most elaborate display of tile work in the South Asia.