The post-Angkor period of Cambodia (Khmer: ប្រទេសកម្ពុជាក្រោយសម័យអង្គរ), also called the Middle period, refers to the historical era from the early 15th century to 1863, the beginning of the French protectorate of Cambodia. As reliable sources (for the 15th and 16th centuries, in particular) are very rare, a defensible and conclusive explanation that relates to concrete events that manifest the decline of the Khmer Empire, recognised unanimously by the scientific community, has so far not been produced. However, most modern historians have approached a consensus in which several distinct and gradual changes of religious, dynastic, administrative and military nature, environmental problems and ecological imbalance coincided with shifts of power in Indochina and must all be taken into account to make an interpretation. In recent years scholars' focus has shifted increasingly towards human–environment interactions and the ecological consequences, including natural disasters, such as flooding and droughts.
Stone epigraphy in temples, which had been the primary source for Khmer history, is already a rarity throughout the 13th century, ends in the third decade of the fourteenth, and does not resume until the mid-16th century. Recording of the Royal Chronology discontinues with King Jayavarman IX Parameshwara (or Jayavarma-Paramesvara), who reigned from 1327 to 1336. There exists not a single contemporary record of even a king’s name for over 200 years. Construction and maintenance of monumental temple architecture had come to a standstill after Jayavarman VII's reign. According to author Michael Vickery there only exist external sources for Cambodia’s 15th century, the Chinese Ming Shilu ("Veritable Records") and the earliest Royal Chronicle of Ayutthaya, which must be interpreted with greatest caution.
The single incident which undoubtedly reflects reality, the central reference point for the entire 15th century, is a Siamese intervention of some undisclosed nature at the capital Yasodharapura (Angkor Thom) around the year 1431. Historians relate the event to the shift of Cambodia's political centre southward to the river port region of Phnom Penh and later Longvek.
Sources for the 16th century are more numerous, although still coming from outside of Cambodia. The kingdom's new capital was Longvek, on the Mekong, which prospered as an integral part of the 16th century Asian maritime trade network, via which the first contact with European explorers and adventurers occurred. The rivalry with the Ayutthaya Kingdom in the west resulted in several conflicts, including the Siamese conquest of Longvek in 1594. The Vietnamese southward expansion reached Prei Nokor/Saigon at the Mekong Delta in the 17th century. This event initiates the slow process of Cambodia losing access to the seas and independent marine trade.
Siamese and Vietnamese dominance intensified during the 17th and 18th century, provoking frequent displacements of the seat of power as the Khmer monarch's authority decreased to the state of a vassal. Both powers alternately demanded subservience and tribute from the Cambodian court. In the mid 19th century, with dynasties in Siam and Vietnam firmly established, Cambodia was placed under joint suzerainty between the two regional empires, thereby the Cambodian kingdom lost its national sovereignty. British agent John Crawfurd states: "...the King of that ancient Kingdom is ready to throw himself under the protection of any European nation..." To save Cambodia from being incorporated into Vietnam and Siam, King Ang Duong agreed to colonial France's offers of protection, which took effect with King Norodom Prohmbarirak signing and officially recognising the French protectorate on 11 August 1863.
Historical background and causes
The Khmer Empire had steadily gained hegemonic power over most of mainland Southeast Asia since its early days in the 8th and 9th centuries. Rivalries and wars with its western neighbour, the Pagan Kingdom of the Mon people of modern-day Burma were less numerous and decisive than those with Champa to the east. The Khmer and Cham Hindu kingdoms remained for centuries preoccupied with each other's containment and it has been argued that one of the Khmer's military objectives was "...in the reigns of the Angkor kings Suryavarman II and Jayavarman VII." the conquest of the Cham ports, "...important in the international trade of the time". Even though the Khmer suffered a number of serious defeats, such as the Cham invasion of Angkor in 1177, the empire quickly recovered, capable to strike back, as it was the case in 1181 with the invasion of the Cham city-state of Vijaya.
Mongol incursions into southern China and political and cultural pressure caused the southward migration of the Tai people and Thai people and their settling on the upper Chao Phraya River in the 12th century. The Sukhothai Kingdom and later the Ayutthaya Kingdom were established and "...conquered the Khmers of the upper and central Menam [Chao Phraya River] valley and greatly extended their territory..."
Military setbacks
Although a number of sources, such as the Cambodian Royal Chronicles and the Royal chronicles of Ayutthaya contain recordings of military expeditions and raids with associated dates and the names of sovereigns and warlords, several influential scholars, such as David Chandler and Michael Vickery doubt the accuracy and reliability of these texts. Other authors, however, criticise this rigid "overall assessment".
David Chandler states in A Global Encyclopedia of Historical Writing, Volume 2: "Michael Vickery has argued that Cambodian chronicles, including this one, that treat events earlier than 1550 cannot be verified, and were often copied from Thai chronicles about Thailand..."
Linguist Jean-Michel Filippi concludes: "The chronology of Cambodian history itself is more a chrono-ideology with a pivotal role offered to Angkor." Similarities apply to Thai chronological records, with the notable example of the Ramkhamhaeng controversy.
According to the Siamese Royal chronicles of Paramanuchitchinorot, clashes occurred in 1350, around 1380, 1418 and 1431.
"In 1350/51; probably April 1350 King Ramadhipati had his son Ramesvara attack the capital of the King of the Kambujas (Angkor) and had Paramaraja (Pha-ngua) of Suphanburi advance to support him. The Kambuja capital was taken and many families were removed to the capital Ayudhya.
At that time, [around 1380] the ruler of Kambuja came to attack Chonburi, to carry away families from the provinces eastwards to Chanthaburi, amounting to about six or seven thousand persons who returned [with the Cambodian armies] to Kambuja. So the King attacked Kambuja and, having captured it, returned to the capitol.[sic]
Then [1418] he went to attack Angkor, the capital of Kambuja, and captured it."
Land or people debate
Siamese sources record the habit of capturing sizeable numbers of inhabitants from the capital cities and centres of civilisation of the defeated parties in Chiang Mai and Angkor which can be assumed to have accelerated the cultural decline.
Author Michael Vickery debates the degree of importance of this subject in his publication "Two Historical Records of the Kingdom of Vientiane - Land or People?": "It is not at all certain that Angkor desired manpower in central Thailand, rather than simply control over the rich agricultural resources." and "...whether the political economy of early Southeast Asia resulted in rulers being more concerned with control of land or control of people..." and "...both sides of this discussion have offered ad hoc, case-by-case pronunciamentos, which are then repeated like mantra... Critical discussion of the question is long overdue..."
Author Akin Rabibhadana, who quotes Ram Khamhaeng: "One particular characteristic of the historical Southeast Asian mainland states was the lack of manpower. The need for manpower is well illustrated by events following each war between Thailand and her neighbours. The victorious side always carried off a large number of people from the conquered territory. Whole villages were often moved into the territory of the conqueror, where they were assimilated and became the population of the conqueror."
David K. Wyatt: "As much as anything else, the Tai müang was an instrument for the efficient use of manpower in a region where land was plentiful in relation to labor and agricultural technology."
Baker and Phongpaichit argues that, "War in the region [Southeast Asia] was... an enterprise to acquire wealth, people, and scarce urban resources."
Bronson states, "No farmers in any region outside southern and eastern Asia could produce as much food with as little labor from the same amount of land."
And Aung-Thwin wrote: "Much of the warfare of early Southeast Asia witnessed the victor carrying off half the population of the vanquished foe and later resettling them on his own soil. Pagan was located in the dry belt of Burma, and depended mainly upon irrigated agriculture for its economic base. Land was plentiful but labor was extremely difficult to obtain."
Dynastic and religious factors
The complete transition from the early Khmer kingdom to the firm establishment of the Mahidharapura dynasty (first king Jayavarman VI, 1080 to 1107), which originated west of the Dângrêk Mountains at Phimai in the Mun river valley lasted several decades. Some historians argue, that these kings failed to acquire absolute central administrative control and had limited access to local resources. The dynasty discontinued "ritual policy" and genealogical traditions. Further momentum ensued as Mahayana Buddhism was eventually tolerated and several Buddhist kings emerged, including Suryavarman I, Rajendravarman II and Jayavarman VII.
These rulers were not considered, and did not consider themselves, as divine, which lead to a shift in perception of royal authority, central power and a loss of dynastic prestige with respect to foreign rulers. Effectively the royal subjects were given permission to re-direct attention and support from the Hindu state of military dominance with its consecrated leader, the "Varman"—protector king, towards the inner-worldly alternative with the contradictory teachings of the Buddhist temple. Indravarman III (c. 1295-1308) adopted Theravada Buddhism as the state religion, which implied an even more passive, introverted focus towards individual and personal responsibility to accumulate merit to achieve nirvana.
Miriam T. Stark argues that competition and rivalries in royal succession, usurpers and "second grade" rulers characterised the kingdom since the 9th century. Periods of "...consolidation alternated with political fragmentation [as] only few rulers were able to wrest control from the provincial level".
Debate remains on the progress of the imperial society as the kingdom grew and occupied foreign lands. Authors present numerous theories about the relationship between Southeast Asian kings and the populace's loyalties, nature and degree of identity, the Mandala concept and the effects of changing state-religion. Scholar Ben Kiernan highlights a tendency to identify with a universal religion rather than to adhere to the concept of a people or nation, as he refers to author Victor Lieberman in: Blood and Soil: Modern Genocide 1500-2000 "[local courts make]...no formal demand, that rulers be of the same ethnicity as their subjects"
Environmental problems and infrastructural breakdown
Historians increasingly maintain the idea that decline was caused by progressing ecological imbalance of the delicate irrigation network and canal system of "...a profoundly ritualized, elaborate system of hydraulic engineering..." at Angkor's Yasodharapura. Recent studies indicate that the irrigation system was overworked and gradually started to silt up, amplified by large scale deforestation. Permanent monument construction projects and maintenance of temples instead of canals and dykes put an enormous strain on the royal resources and drained thousands of slaves and common people from the public workforce and caused tax deficits.
Author Heng L. Thung addressed common sense in "Geohydrology and the decline of Angkor" as he sums things up: "...the preoccupation of the Khmers with the need to store water for the long dry season. Each household needed a pond to provide drinking and household water for both man and beast. The barays [reservoirs] of Angkor were simply the manifestation of the need of an urban population. Water was the fountain of life for Angkor; a disruption in its supply would be fatal."
Recent Lidar (Light detection and ranging) Geo-Scans of Angkor have produced new data, that have caused several "Eureka moments" and "have profoundly transformed our understanding of urbanism in the region of Angkor". Results of dendrochronological studies imply prolonged periods of drought between the 14th and 15th centuries. As a result, recent re-interpretations of the epoch put greater emphasis on human–environment interactions and the ecological consequences.
Growth of international maritime trade
Some historians have argued that an important reason for the Angkor court's move to the lower Mekong Delta was due to the growth of international maritime trade with the rest of the world. Angkor, being primarily inland and largely agricultural, became increasingly irrelevant to the global markets in comparison to the later maritime Cambodian capitals at Longvek, Oudong, and later Phnom Penh.
Chaktomuk era
Following the abandonment of the capital Yasodharapura and the Angkorian sites, the Angkor elites established a new capital around two-hundred kilometres to the south-east on the site which is modern day Phnom Penh, at the confluence of the Mekong and the Tonle Sap river. Thus, it controlled the river commerce of the Khmer heartland, upper Siam and the Laotian kingdoms with access, by way of the Mekong Delta, to the international trade routes that linked the Chinese coast, the South China Sea, and the Indian Ocean. Unlike its inland predecessor, this society was more open to the outside world and relied mainly on commerce as the source of wealth. The adoption of maritime trade with China during the Ming dynasty (1368–1644) provided lucrative opportunities for members of the Cambodian elite who controlled royal trading monopolies.
Historians consent that as the capital ceased to exist, the temples at Angkor remained as central for the nation as they always had been. David P. Chandler: "The 1747 inscription is the last extensive one at Angkor Wat and reveals the importance of the temple in Cambodian religious life barely a century before it was "discovered" by the French."
Longvek era
King Ang Chan I (1516–1566) moved the capital from Phnom Penh north to Longvek at the banks of the Tonle Sap river. Trade was an essential feature and "...even though they appeared to have a secondary role in the Asian commercial sphere in the 16th century, the Cambodian ports did indeed thrive." Products traded there included precious stones, metals, silk, cotton, incense, ivory, lacquer, livestock (including elephants), and rhinoceros horn.
Messengers of Portuguese admiral Alfonso de Albuquerque, conqueror of Malacca arrived in Indochina in 1511, the earliest documented official contact with European sailors. By the late 16th and early 17th centuries, Longvek maintained flourishing communities of Chinese, Indonesian, Malay, Japanese, Arab, Spanish, English, Dutch, and Portuguese traders.