Thonglun province

Thonglun province (: ແຂວງທອງລຸນ, Aekhuang Thonglun; : เอกวง ทองลุน, Ayguang Taawngloon) is a province in southwest Lomtai. It is a territory contested by Sukaphum. It borders Sukaphum (X) to the south, Nasay province to the west, Saynad province to the north, and Phaylin province to the east. Thonglun province has a population of 5.3 million, making it the least populated province in the country.

The capital and largest city of Thonglun is Pantuhom, with only two other cities Saisomboun and Houaysay.

Thonglun province was established in 1940 following the Khon Pa Agreement (1940) in which the Pratuhup province territory was returned to Lomtai. Thonglun was known as Changwat Pratuhup during the Sukaphumese occupation of the region.

=History=

Thonglun province under Sukaphumese rule
In the 1850s, the Lom Kingdom established plans for an invasion of Wanh. In Guwol of 1868 Lomtai invaded western Wanh, three months later in Sibiwol, Vạn Xuân declared war on Lomtai. Sukaphum is initially neutral, though after the Lom invasion of Tonklakatomnam and the Battle of Pratuhup in 1870, Sukaphum allies with Vạn Xuân against Lomtai. The war would end in Parwol of 1875 when Sukaphumese and Vạn Xuânese military laid siege to Banvuchuan, and forced Lomtai to surrender to the terms of the Treaty of Banvuchuan. Shortly after Lomtai’s surrender, Lomtai retracted all remaining forces from Wanh, and Sukaphum and Vạn Xuân followed by removing all of their military presence from Lomtai. Per terms of the Treaty of Banvuchuan, Lomtai ceded the entirety of the province of Thonglun, as well as small portions of Phaylin province and Nasay province to Sukaphum. Together these territories formed the Sukaphumese province of Pratuhup.

Pratuhup province (谷門 ; : จังหวัดประตูหุบเขา, "Changwat Pratuhup"; : ແຂວງປະຕູຮ່ອມ, "Aekhuang Patuhom") was a provinces in northeast Sukaphum from Parwol, 1875 to Chirwol, 1940. It consisted of the territories ceded to Sukaphum by Lomtai at the end of the Khon Pa War (1868 – 1875). The capital and largest city of Pratuhup province was Pratuhup city (Patuhom), after which the province is named. Beginning in the 1900s, Pratuhup province became by upscale, wealthy Sukaphumese, causing many ethnic Loms to immgrate to Lomtai.

Reclamation of Thonglun
In 1940 Chanthalangsy Phayvanh, Grand Chairman of the Democratic People's Commune of Lomtai, ordered the annexation of Pratuhup province in Sukaphum.

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=Sukaphumese territorial dispute=