After the middle of the 14th century , the establishment two kingdoms, name Lanna in the north with Chiang Mai as it centre and Ayuttaya in the south, put the Kingdom of Sukhothai in a difficult situation since the former could occupy Tak which once was a dependency of Sukhothai while the latter could control the Chao Phraya basin.
Somdet Phra Ramathibodi I (King U - Thong) of Ayuttaya besieg Song Khawae (Phitsanulok) and took hold of the town. Phra Maha Dharmaraja Li Thai has to pay tribute in return for Song Khawae, and he himself move to reside there and let Mahadevi, his younger sister reign over Sukhothai. The said incident clearly indicated Sukhothai Kings began lose their right and authority to rule the whole Kingdom.
Somdet Phra Ramathibodi I (King U - Thong) of Ayuttaya besieg Song Khawae (Phitsanulok) and took hold of the town. Phra Maha Dharmaraja Li Thai has to pay tribute in return for Song Khawae, and he himself move to reside there and let Mahadevi, his younger sister reign over Sukhothai. The said incident clearly indicated Sukhothai Kings began lose their right and authority to rule the whole Kingdom.
When Somdet Phra Ramathibodi I of Ayuttaya died in 1368 AD, Phra Maha Dharmaraja Li Thai tried to revive Sukhothai to it earlier state as the centre of the Kingdom, but he could not bring political role into prominence, for he died in 1369 AD. In the meantime, Somdet Phra Borommarachathirat I (Pho Ngua) reigned over Ayuttaya and sent his armed forces to seize Sukhothai and other town in the Sukhothai Kingdom.
Thence, the Ayuttaya Royal dynasty made every effort to gradually dominate over the Kingdom of Sukhothai by mean of intermarriage between member of the two dynastie, peaceful penetration into aristocratic system and also supply of manpower to Sukhothai royalties who related to the royal family of the Kingdom of Ayuttaya.
In 1438 AD at the latest, the whole Kingdom of Sukhothai was apparently annexed Ayuttaya and was called "northern region" by the Ayuttaya people because in that year Somdet Phra Borommarachathirat II (King Sam Phraya) sent his son, Phra Ramesuan, whose mother was a Sukhothai princess, to rule over the northern region Phitsanulok as Maha Uparaja (Viceroy) of a dependency of the Ayuttaya Kingdom. When Phra Ramesuan became the king of Ayuttaya in 1450, known as Somdet Phra Boromatrailokanat. When the 'northern region' was invaded by the troop of Lanna, he moved a troop from Ayuttaya to settle in Phitsanulok in 1464. Phitsanulok became the capital of northern region instead of Sukhothai. And Somdet Phra Boromatrailokanat was the last king who ruled the state and he died at Phitsanulok in 1487
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