Chairacha

Chairacha led a military campaign against the northern kingdom of Lanna, capturing the city of Chiang Mai after a prolonged siege. The victory expanded Ayutthaya's control over northern territories, though the occupation was short-lived due to Lanna resistance and logistical challenges.

Chairacha suppressed a rebellion by the Mon people in the western provinces of Ayutthaya. The rebellion was crushed with significant force, reaffirming royal authority over the Mon population. However, the harsh suppression created lasting resentment among the Mon community.

Chairacha was poisoned by his consort, Lady Sri Sudachan, who then placed her lover on the throne. This assassination destabilized the Ayutthayan monarchy, leading to a period of political turmoil and a succession crisis that weakened the kingdom and made it vulnerable to external threats.