Ministerial offices and governorships--and the sakdi na that went with them--were usually inherited positions dominated by a few families often connected to the king by marriage. Indeed, marriage was frequently used by Thai kings to cement alliances between themselves and powerful families, a custom prevailing through the nineteenth century. As a result of this policy, the king's wives usually numbered in the dozens.
The Siamese state based at Ayutthaya in the valley of the Chao Phraya River grew from the earlier kingdom of Lopburi, which it absorbed, and its rise continued the steady shift southwards of the centre of gravity of the Tai-speaking peoples. U Thong was an adventurer allegedly descended from a rich Chinese merchant family who married royalty. In 1350, to escape the threat of an epidemic, he moved his court south into the rich floodplain of the Chao Phraya. On an island in the river he founded a new capital, which he called Ayutthaya, after Ayodhya in northern India, the city of the hero Rama in the Hindu epic Ramayana. U Thong assumed the royal name of Ramathibodi (1350-60).
This strongman approach which had worked for Phibun in 1938 and 1947, and for Sarit in 1957-58 would prove to be unsuccessful. By the early 1970s Thai society as a whole had developed a level of political awareness where it would no longer accept such unjustified authoritarian rule. The King, using various holidays to give speeches on public issues, became openly critical of the Thanom-Praphas regime. He expressed doubt on the use of extreme violence in the efforts to combat insurgency. He mentioned the widespread existence of corruption in the government and expressed the view that coups should become a thing of the past in the Thai political system. Furthermore, the junta began to face increasing opposition from within the military itself. Being preoccupied with their political roles, Thanom and Praphas had become more removed from direct control of the army. Many officers felt outraged by the rapid promotion of Narong and the fact that he seemed destined to be Thanom's successor. To these officers, it appeared that a political dynasty was being created.
In the early 20th century these crises were adopted by the increasingly nationalist government as symbols of the need for the country to assert itself against the West and its neighbours.
The population began to grow explosively as the standard of living rose, and a flood of people began to move from the villages to the cities, and above all to Bangkok. Thailand had 30 million people in 1965, while by the end of the 20th century the population had doubled. Bangkok's population had grown tenfold since 1945 and had trebled since 1970.
The French presence encouraged by Phaulkon, however, stirred the resentment and suspicions of the Thai nobles and Buddhist clergy. When word spread that Narai was dying, a general, Phra Phetracha, killed the designated heir, a Christian, and had Phaulkon put to death along with a number of missionaries.
The arrival of English warships provoked a massacre of more Europeans. Phetracha (reigned 1688-93) seized the throne, expelled the remaining foreigners, and ushered in a 150-year period during which the Thai consciously isolated themselves from contacts with the West.
Lanna was not to be an indepedent kingdom again. In 1877 a Viceroy from Bangkok ruled together with the king. In 1892 Lanna was formally annexed by Siam, and administrated as the Monthon Phayap. The last of the Lannathai kings, Chao Keo Naovarat, never held any true administrative power.
The regimes of Sarit and Thanom were strongly supported by the U.S. Thailand had formally become a U.S. ally in 1954 with the formation of the Southeast Asia Treaty Organization (SEATO). While the war in Indochina was being fought between the Vietnamese and the French, Thailand (disliking both equally) stayed aloof, but once it became a war between the U.S. and the Vietnamese Communists, Thailand committed itself strongly to the U.S. side, concluding a secret agreement with the U.S. in 1961, sending troops to Vietnam and Laos and allowing the U.S. to open airbases in the east of the country to conduct its bombing war against North Vietnam. The Vietnamese retaliated by supporting the Communist Party of Thailand's insurgency in the north and northeast.
In 1833, the United States began diplomatic exchanges with Siam, as Thailand was called until 1939 (and again between 1945 and 1949). However, it was during the later reigns of King Mongkut (Rama IV, 1851-1868), and his son King Chulalongkorn (Rama V, 1868-1910), that Thailand established firm rapprochement with Western powers.
The Thai kingdom was not a single, unified state but rather a patchwork of self-governing principalities and tributary provinces owing allegiance to the king of Ayutthaya under the mandala system. These states were ruled by members of the royal family of Ayutthaya who had their own armies and warred among themselves.
Despite orders from Thanom that the military action be intensified, army commander Kris Sivara had the army withdrawn from the streets.
All that remains of the old city are some impressive ruins of the royal palace. King Taksin established a capital at Thonburi, across the Chao Phraya from the present capital, Bangkok. The ruins of the historic city of Ayutthaya and "associated historic towns" in the Ayutthaya historical park have been listed by the UNESCO as World Heritage Sites. The city of Ayutthaya was refounded near the old city, and is now capital of the Ayutthaya province.
By 1955 Phibun was losing his leading position in the army to younger rivals led by Field Marshal Sarit Thanarat and General Thanom Kittikachorn. To shore up his position he restored the 1949 constitution and called elections, which his supporters won. But the army was not prepared to give up power, and in September 1957 it demanded Phibun's resignation. When Phibun tried to have Sarit arrested, the army staged a bloodless coup on September 17, 1957, ending Phibun's career for good. Thanom became Prime Minister until 1958, then yielded his place to Sarit, the real head of the regime. Sarit held power until his death in 1963, when Thanom again took the lead.
The first ruler of the Kingdom of Ayutthaya, King Ramathibodi I, made two important contributions to Thai history: the establishment and promotion of Theravada Buddhism as the official religion - to differentiate his kingdom from the neighboring Hindu kingdom of Angkor - and the compilation of the Dharmashastra, a legal code based on Hindu sources and traditional Thai custom.