Being the largest preindustrial city in the world, with an elaborate system of infrastructure connecting an urban sprawl of at least 1,000 square kilometres (390 sq mi) to the well-known temples at its core, Angkor city in Cambodia served as the Khmer Empire from 9th to 15th centuries. The temples of the Angkor area number over one thousand, ranging in scale from nondescript piles of brick rubble scattered through rice fields to the magnificent Angkor Wat, said to be the world's largest single religious monument. Many of the temples at Angkor have been restored, and together, they comprise the most significant site of Khmer architecture.
The Angkorian period began in AD 802, when the Khmer Hindu monarch Jayavarman II declared himself a "universal monarch" and "god-king", until 1351, when Angkor first fell under Ayutthayan suzainry, to 1431, when Ayutthaya put down a rebellion and sacked the Khmer capital, causing its population to migrate south to the area of Phnom Penh. In 889, Yasovarman took over the throne who was a great ruler. He built a new city known as Yasodharapura and a new reservoir called Baray.
Over the next 300 years, between 900 and 1200, the Khmer Empire produced some of the world's most magnificent architectural masterpieces in the area known as Angkor. Most are concentrated in an area approximately 15 miles (24 km) east to west and 5 miles (8.0 km) north to south, although the Angkor Archaeological Park, which administers the area, includes sites as far away as Kbal Spean, about 30 miles (48 km) to the north. Some 72 major temples or other buildings are found within this area, and the remains of several hundred additional minor temple sites are scattered throughout the landscape beyond. Because of the dispersed, low-density nature of the medieval Khmer settlement pattern, Angkor lacks a formal boundary, and its extent is therefore difficult to determine. However, a specific area of at least 1,000 km2 (390 sq mi) beyond the major temples is defined by a complex system of infrastructure, including roads and canals that indicate a high degree of connectivity and functional integration with the urban core. In terms of spatial extent, this makes it the largest urban agglomeration in human history prior to the Industrial Revolution, easily surpassing the nearest claim, that of the Mayan city of Tikal. In fact, in terms of its urban sprawl, medieval Angkor even approaches the size of modern Los Angeles, and is said to have been seventeen times larger than Manhattan Island.
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