 The evidence indicating that his father is not yet clear, In Royal Chronicle by the Venerable Vanarata of Pakaeo Temple and Royal Chronicle (Rattanakosin edition) only stating that "King Chairachathirat is a royal family in King Ramathibodi.And the Pali literature "Sangitiyavansa", which authored in the reign of King Rama I by Venerable Vanarata of Pho Temple, stating that he is the nephew, is son's sister of Ramathibodi.In 1533, following the death of King Borommaracha IV, Prince Ratsadathirat (Borommaracha IV's son) succeeded the Ayutthayan throne.