Editing Sukhothai Kingdom (section)

===Annexation and further influence===
Under tributary status, the former territories of Sukhothai, known to the people of Ayutthaya as the '''Northern Cities''' ({{langx|th|เมืองเหนือ}}, {{RTGS|''Mueang Nua''}}), continued to be ruled by local aristocrats under Ayutthaya's overlordship per the [[Mandala (political model)|mandala]] systems of both dominions. The mandalas would politically and culturally merge during the 15th and 16th centuries, and Sukhothai's warfare, administration, architecture, religious practice, and language influenced those of Ayutthaya. Sukhothai nobles linked themselves with the Ayutthayan elite through marriage alliances, and often played the role of [[kingmaker]] in Ayutthayan succession conflicts. Sukhothai military leaders served prominently in Ayutthaya's army as the military tradition of Sukhothai was considered to be tougher.<ref name="BakerPasuk14_10">{{Cite book|author1=Chris Baker|title=A History of Thailand|author2=Pasuk Phongpaichit|publisher=Cambridge University Press|year=2014|edition=3rd|page=10}}</ref>

From 1456 to 1474, former Sukhothai territory became a battleground during the [[Ayutthaya-Lan Na War]] (1441–1474). In 1462, Sukhothai briefly rebelled against Ayutthaya and allied itself with their enemy, [[Lan Na]]. In 1463, Borommatrailokkanat temporarily moved the monarch's residence to Song Khwae, presumably to be closer to the frontline, and the city was permanently renamed to Phitsanulok.{{Citation needed|date=September 2024}} Contemporary [[Portuguese Empire|Portuguese]] traders described Ayutthaya and Phitsanulok as "twin states".<ref name="BakerPasuk14_10"/>

In 1548, [[Maha Chakkraphat]] named Khun Phirenthorathep, a noble from the Sukhothai clan, as the leader in Phitsanulok. Phirenthorathep was conferred with the name [[Maha Thammaracha (king of Ayutthaya)|Maha Thammaracha]] in line with the historical kings of Sukhothai, and married one of Maha Chakkraphat's daughters, strengthening his claim to both a historical and present monarchy. Despite this, the title of Upparat went to Maha Chakkraphat's son [[Ramesuan (prince of Ayutthaya)|Ramesuan]] (who died in 1564) and later his brother [[Mahinthrathirat]]. After a series of wars with the Burmese [[First Toungoo Empire|Toungoo Empire]], Maha Thammaracha allied himself with the Burmese against Ayutthaya. In 1569, Ayutthaya under Mahinthrathirat fell to the Burmese, and [[Bayinnaung]] installed Maha Thammaracha (Sanphet I) as the vassal king in Ayutthaya and the first king of the [[List of Thai monarchs#Ayutthaya Kingdom (1351–1767)|Sukhothai dynasty]].<ref name="BakerPasuk14_10" />

In 1584, Maha Thammaracha and his son, the Upparat and future [[Naresuan|Naresuan the Great]] (Sanphet II), would free Ayutthaya from Burmese overlordship in the [[Burmese–Siamese War (1584–1593)|Burmese-Siamese War of 1584–1593]]. After the Battle of the Sittaung River, Naresuan forcibly relocated people from the northern cities of [[Phitsanulok]], [[Mueang Sukhothai District|Sukhothai]], [[Phichai District|Phichai]], [[Sawankhalok District|Sawankhalok]], [[Kamphaeng Phet]], [[Phichit]], and [[Nakhon Sawan province|Phra Bang]] closer to Ayutthaya.<ref>{{cite book|author= Phisēt Čhīačhanphong|title= พระมหาธรรมราชากษัตราธิราช|url=http://www.matichonbook.com/index.php?mnuid=5&selmnu=470426104014|location=กรุงเทพฯ|publisher=สำนักพิมพ์มติชน|year= 2003|isbn=974-322-818-7|page=57}}
</ref><ref>{{Cite book |author1=Chris Baker |author2=Pasuk Phongpaichit |title=A History of Ayutthaya |publisher=Cambridge University Press |year=2017 |page=77}}</ref> Since then, the ruins of the capital city of the former Sukhothai Kingdom have been preserved as the [[Sukhothai Historical Park]] and designated a [[World Heritage Site]].<ref>{{Cite web|title=Historic Town of Sukhothai and Associated Historic Towns|url=https://whc.unesco.org/en/list/574/|access-date=2021-11-08|website=UNESCO World Heritage Centre|language=en}}</ref>