In 1433 Samphraya led Siamese forces to subjugate Cambodia plundering Angkor Thom.
This assault eventually caused the Khmers to abandon Angkor and to relocate their capital further south-east.
To escape the influence of Siam, and wanting to move the center closer to the sea to further promote maritime trade.
The conquest, however, brought in a large influx of Khmer culture and traditions into the Siamese court.
Chao Sam Phraya died in 1448 and was succeeded by his son Prince Ramesuan as Trilokanat.