Maha Thammaracha IV (, ), born as Borommapan (, ), was the last king of the Sukhothai Kingdom.
In 1419, after the death of Sai Lue Thai, his sons Phaya Ram and Phaya Ban Mueang fought for the throne. Chusak Satienpattanodom puts that death eleven years earlier, in 1408. Intharacha of Ayutthaya Kingdom intervened and further divided the kingdom between the two. On Chusak's account the division was into four at once, under Boromapan at Phitsanulok, Phaya Ramratchathirat at Sukhothai, Phaya Saen Soi Dao at Kamphaeng Phet and Phaya Sai Si Yot at Chaliang. Ban Mueang was installed as a vassal king, owing allegiance to Ayutthaya. His residence was in Phitsanulok, though the kingdom was still referred to as "Sukhothai". None of the rulers set up at this point used the paired style "Si Satchanalai Sukhothai" that earlier kings of the house had claimed. In 1430, he moved his residence back to the old capital. Chusak reads an ordination dispute of the same year as evidence that the four towns acted separately. A returning forest-order party was admitted at Phitsanulok and Sukhothai, refused at Kamphaeng Phet, and refused at Sawankhalok by Phaya Chaliang. When Maha Thammaracha IV died in 1438, King Borommaracha II of Ayutthaya installed his son Ramesuan (the future king Borommatrailokkanat of Ayutthaya) as viceroy of Sukhothai, thus marking the end of Sukhothai as a separate kingdom.
Ancestry
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