Pre-Angkorian and Angkorian eras

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During the 3rd, 4th, and 5th centuries, the Indianised states of Funan and Chenla coalesced in present-day Cambodia and southwestern Vietnam. For more than 2,000 years, Cambodia absorbed influences from India, passing them on to other Southeast Asian civilizations that are now Thailand and Laos.The Khmer Empire flourished in the area from the 9th to the 13th centuries. Around the 13th century, Theravada Buddhism was introduced to the area through monks from Sri Lanka. From then on, Theravada Buddhism grew and eventually became the popular religion.

The Khmer Empire was Southeast Asia's largest empire during the 12th century and it remained very powerful. The empire declined yet remained powerful in the region until the 15th century. The empire's centre of power was Angkor, where a series of capitals was constructed during the empire's zenith. In 2007 an international team of researchers using satellite photographs and other modern techniques concluded that Angkor had been the largest pre-industrial city in the world with an urban sprawl of 1,150 square miles.The city could have supported a population of up to one million people and Angkor Wat, the most famous and best-preserved religious temple at the site, are reminders of Cambodia's past as a major regional power.