Jayavarman VII

Following the death of Suryavarman around 1150 A.D., the kingdom fell into a period of internal strife. Its neighbors to the east, the Cham of what is now southern Vietnam, took advantage of the situation in 1177 to launch a seaborne invasion up the Mekong River and across Tonle Sap. The Cham forces were successful in sacking the Khmer capital of Yasodharapura and in killing the reigning king. However, a Khmer prince who was to become King Jayavarman VII rallied his people and defeated the Cham in battles on the lake and on the land. In 1181, Jayavarman assumed the throne. He was to be the greatest of the Angkorian kings.[13] Over the ruins of Yasodharapura, Jayavarman constructed the walled city of Angkor Thom, as well as its geographic and spiritual center, the temple known as the Bayon. Bas-reliefs at the Bayon depict not only the king's battles with the Cham, but also scenes from the life of Khmer villagers and courtiers. In addition, Jayavarman constructed the well-known temples of Ta Prohm and Preah Khan, dedicating them to his parents. This massive program of construction coincided with a transition in the state religion from Hinduism to Mahayana Buddhism, since Jayavarman himself had adopted the latter as his personal faith. During Jayavarman's reign, Hindu temples were altered to display images of the Buddha, and Angkor Wat briefly became a Buddhist shrine. Following his death, a Hindu revival included a large-scale campaign of desecrating Buddhist images, until Theravada Buddhism became established as the land's dominant religion from the 14th century.[14]

Zhou Daguan

The year 1296 marked the arrival at Angkor of the Chinese diplomat Zhou Daguan. Zhou's one-year sojourn in the Khmer capital during the reign of King Indravarman III is historically significant, because he penned a still-surviving account of approximately 40 pages detailing his observations of Khmer society. Some of the topics he addressed in the account were those of religion, justice, kingship, agriculture, slavery, birds, vegetables, bathing, clothing, tools, draft animals, and commerce. In one passage, he described a royal procession consisting of soldiers, numerous servant women and concubines, ministers and princes, and finally, "the sovereign, standing on an elephant, holding his sacred sword in his hand." Together with the inscriptions that have been found on Angkorian stelas, temples and other monuments, and with the bas-reliefs at the Bayon and Angkor Wat, Zhou's journal is the most important source of information about everyday life at Angkor. Filled with vivid anecdotes and sometimes incredulous observations of a civilization that struck Zhou as colorful and exotic, it is an entertaining travel memoir as well.[15]

End of the Angkorian period

The end of the Angkorian period is generally set at 1431 A.D., the year Angkor was sacked and looted by Thai invaders, though the civilization already had been in decline in the 13th and 14th centuries. During the course of the 15th century, nearly all of Angkor was abandoned, except for Angkor Wat, which remained a Buddhist shrine. Several theories have been advanced to account for the decline and abandonment of Angkor:

War with the Thai

It is widely believed that the abandonment of the Khmer capital occurred as a result of Siamese invasions. Ongoing wars with the Siamese were already sapping the strength of Angkor at the time of Zhou Daguan toward the end of the 13th century. In his memoirs, Zhou reported that the country had been completely devastated by such a war, in which the entire population had been obligated to participate.[16] After the collapse of Angkor in 1431, many persons, texts and institutions were taken to the Thai capital of Ayutthaya in the west, while others departed for the new center of Khmer society at Longvek further south, though the official capital later moved, first to Oudong (around 45 km from Phnom Penh, in Ponhea Leu District), and then to the present site of Phnom Penh.

Erosion of the state religion

Some scholars have connected the decline of Angkor with the conversion of Cambodia to Theravada Buddhism following the reign of Jayavarman VII, arguing that this religious transition eroded the Hindu conception of kingship that undergirded the Angkorian civilization.[17] According to Angkor scholar George Coedès, Theravada Buddhism's denial of the ultimate reality of the individual served to sap the vitality of the royal personality cult which had provided the inspiration for the grand monuments of Angkor.[18]

Neglect of public works
According to George Coedès, the weakening of Angkor's royal government by ongoing war and the erosion of the cult of the devaraja undermined the government's ability to engage in important public works, such as the construction and maintenance of the waterways essential for irrigation of the rice fields upon which Angkor's large population depended for its sustenance. As a result, Angkorian civilization suffered from a reduced economic base, and the population was forced to scatter.[19]

Natural disaster
Other scholars attempting to account for the rapid decline and abandonment of Angkor have hypothesized natural disasters such as earthquakes, inundations, or drastic climate changes as the relevant agents of destruction.[19] Recent research by Australian archaeologists suggests that the decline may have been due to a shortage of water caused by the transition from the Medieval Warm Period to the Little Ice Age.[20] LDEO dendrochronological research has established tree-ring chronologies indicating severe periods of drought across mainland Southeast Asia in the early 1400s, raising the possibility that Angkor's canals and reservoirs ran dry and ended expansion of available farmland.[21]

Restoration, preservation, and threats

The great city and temples remained largely cloaked by the forest until the late 19th century, when French archaeologists began a long restoration process. From 1907 to 1970, work was under the direction of the École française d'Extrême-Orient, which cleared away the forest, repaired foundations, and installed drains to protect the buildings from water damage. In addition, scholars associated with the school and including George Coedès, Maurice Glaize, Paul Mus, Philippe Stern and others initiated a program of historical scholarship and interpretation that is fundamental to the current understanding of Angkor.

Work resumed after the end of the Cambodian civil war and, since 1993, has been jointly co-ordinated by the French, Japanese and UNESCO through the International Co-ordinating Committee on the Safeguarding and Development of the Historic Site of Angkor (ICC), while Cambodian work is carried out by the Authority for the Protection and Management of Angkor and the Region of Siem Reap (APSARA), created in 1995. Some temples have been carefully taken apart stone by stone and reassembled on concrete foundations, in accordance with the method of anastylosis. World Monuments Fund has aided Preah Khan, the Churning of the Sea of Milk (a 49-meter-long bas-relief frieze in Angkor Wat), Ta Som, and Phnom Bakheng. International tourism to Angkor has increased significantly in recent years, with visitor numbers reaching 900,000 in 2006; this poses additional conservation problems but has also provided financial assistance to the restoration effort.[22]

Water-table dropping

With the increased growth in tourism at Angkor, new hotels and restaurants are being built to accommodate such growth. Each new construction project drills underground to reach the water table, which has a limited storage capacity. This demand on the water table could undermine the stability of the sandy soils under the monuments at Angkor, leading to cracks, fissures and collapses.[23]