The social hierarchy system developed by this civilization gave slaves a value of 5 units compared to 100,000 units for heirs to the throne, the sakdi na system.  
One ruler of this polity was personally served by the Japanese body guard Yamada, and after the capital of this polity was sacked, several new pagodas devoted to the "Victor of the Ten Directions" were erected in that capital.  The social hierarchy system developed by this civilization gave slaves a value of 5 units compared to 100,000 units for heirs to the throne, the sakdi na system.  An impressive contingent of monks from this polity were sent to Sri Lanka and formed a certain form of Nikaya under the auspices of Upali Maha Thera in the years before its decline.  One ruler of this polity famously sent diplomatic relations to the court of Louis XIV, and was also responsible for appointing Constantine Phaulkon as his chief minister.  Besides King Narai, another ruler of this kingdom changed his name from ?U Thong to Ramathabodi after he founded this kingdom, known for being a bastion of Theravadic Buddhism.  Responsible for sacking Angkor in 1431, for 10 points, name Thai kingdom of the 14th to 18th centuries.
One ruler of this polity was personally served by the Japanese body guard Yamada, and after the capital of this polity was sacked, several new pagodas devoted to the "Victor of the Ten Directions" were erected in that capital.  
Kingdom of {Ayutthaya} [prompt on "{Siam}" or "{Kingdom} of {Siam}"]