Somdet Phra Ratsadathirat was the king of Ayutthaya from 1533 to 1534 - only for 5 months. Prince Ratsadathirat was the son of Somdet Phra Borommaracha Thirat IV who died suddenly in 1533 from an epidemic of smallpox. Prince Ratsadathirat, aged 5, succeeded his father as the king of Ayutthaya. Due to his minority, his government was dominated by a number of regents including the Samuha Na Yok and the Samuha Kalahom.