Background
Chao Sam Phraya (lit The Third Chao Phraya) was a son of Intha Racha who had finally taken the Ayutthayan throne for the Suphannaphum Dynasty.
Chao Sam Phraya (lit The Third Chao Phraya) was a son of Intha Racha who had finally taken the Ayutthayan throne for the Suphannaphum Dynasty.
His reign saw its early expansions. He had two elder brothers: Chao Ai Phraya (lit The First Chao Phraya) and Chao Yi Phraya (lit The Second Chao Phraya), and was appointed by his father to govern Chainat. In 1424, Intha Racha died.
They fought on elephants in single combat and both died, leaving the throne to Chao Sam Phraya.
Chao Sam Phraya 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.
The conquest, however, brought in a large influx of Khmer culture and traditions into the Siamese court. Foreign example, the high reverence of Thai kingship as a deity, known as Devaraja, came from Cambodia.
Chao Sam Phraya also sought northward expansion.
In 1442, Chao Sam Phraya led his armies to conquer Lanna. He managed to sack the capital Chiang Mai but was unable to conquer the kingdom.