According to the Portuguese adventurer autobiography Fernão Mendes Pinto, who stayed for some time at court, the king was poisoned by Sundachan Lanka, although he does not provide details on how she managed to escape punishment.

In its place the eleven year old Yot Fa came to the throne, with his mother Sisudachan and uncle Thianracha, brother of Chairacha and Viceroy with the charge Diuparat.

[4] According to the diplomat and storicoolandese Jeremias van Vliet, director of Ayutthaya office in the seventeenth century the Dutch East India Company, Sisudachan met and fell in love with the Brahmin court Phan Sri Thep, but after the coronation of Yot Fa, while according to Pinto they knew each other from before.

The regent did give her lover a high office in the palace, she gave him the title Khun Chinnarat and entrusted him with the organization of a large number of the young sovereign protection troops.

The reign lasted only a few weeks, a group of nobles of the Sukhothai clan loyalists to the cause of Suphannaphum Dynasty began plotting to murder the couple.