Prince Si Sin had entered monkhood as the means to protect himself from political punishments, as it is against the Theravada law to hurt a monk.

Yamada had then persuaded the prince to go the palace by pretending to support him against Sri Suriyavong.

Having renouncing his monkhood before entering the palace, the former prince is seized by the royal guards and exiled to Phetchaburi, where he is locked up in a well for starvation.

Local monks rescue him, however, and stage a rebellion at Phetburi.

Si Suriyavong sends Yamada to counter Prince Si Sin, who is defeated and captured.

Before being executed, Prince Si Sin reportedly warns his nephew about the ambitions of Suriyavong, who subsequently assumes absolute power and alienates the king by cremating the ashes of his father for the second time (a practice reserved only for royalty).

The Thai aristocracy chooses to attend the funeral instead of the royal audience, which further infuriates the monarch, but Si Suriyavong sends Okya Kamhaeng to calm him down and convince the king of Sri Suriyavong’s loyalty.

Chettha is thus taken by surprise when Sri Suriyavong marches Japanese troops into the palace.

The king flees to Wat Maheyong north of Ayutthaya and is quickly captured and executed, together with his mother, at Wat Kokphraya in 1629.

Sri Suriyavong gives the throne to Chettha’s younger brother, the child prince Athittayawong, for whom he serves as regent.

However, Sri Suriyawong persuades his supporters and the nobility to give him full power and crown him as the second king.

It is then decided that there will not be two kings in the same kingdom and Athitayawong is executed, after reigning for only thirty-eight days, at Wat Kok Phraya, ending the Sukhothai dynasty.

Sri Suriyawong ascends the throne as King Prasat Thong.