Prasat Thong

Prasat Thong was the founder and first monarch of the Prasat Thong dynasty, the fourth ruling house of the Ayutthaya Kingdom. Formerly a high-ranking official known as Okya Kalahom, he rose to prominence during the reign of King Songtham by assisting in the suppression of a rebellion led by the king's son, Phra Sisin, in collaboration with the Japanese mercenary leader Yamada Nagamasa. Following a series of succession crises after Songtham's death, he seized power in 1629, briefly installing the infant Athittayawong as a puppet king before executing him and ascending the throne himself. His reign was marked by the reassertion of Siamese authority over Cambodia, though it also saw a weakening of Ayutthaya's control over its northern principalities.