Trailokanat died in 1488 and Borommarachathirat succeeded his father.
Upon ascension, he moved the capital back to Ayutthaya.
The throne of Sukhothai at Pitsanulok, however, was succeeded by his brother Prince Chettathirat.
He sent Siamese armies to capture the Mon city of Dawei in 1491 and died the same year.
He was succeeded by his brother, Prince Chettathirat as Ramathibodi II.