Sources differ over the nature of their conflict; official chronicles state that the older Boromaracha ruled with the willing consent of his nephew, while Jeremias van Vliet's Short History of Thailand indicated that Boromaracha's ascension came only after a bloody conflict bordering on civil war.
Whatever the case, by 1388 King Ramesuan had gathered sufficient support from his power base in Lavo to return to Ayutthaya and challenge Boromarachi's 17-year-old son Thong Lan for the throne.
King Ramesuan then held the throne until 1395, when he was succeeded by his son Rama (also known as Ramaracha).
Instead, some sources record conflicts with the kingdom of Lan Na (in northern Thailand), and the empire of Angkor.
A similar defeat of Angkor is recorded as having taken place in 1393, in response to raids from the Cambodian kingdom.