Charles VI vs Rama III

Charles VI issued the Pragmatic Sanction, a legal instrument to ensure that the Habsburg hereditary lands could be inherited by a female heir (his daughter Maria Theresa) in the absence of a male son. He spent decades securing recognition from European powers, but it failed to prevent the War of the Austrian Succession.

Charles VI's forces, after a disastrous war with the Ottoman Empire, signed the Treaty of Belgrade. The treaty ceded Belgrade and northern Serbia to the Ottomans, reversing the gains of the Treaty of Passarowitz and weakening Habsburg influence in the Balkans.

Charles VI's death in 1740 triggered the War of the Austrian Succession, as Prussia, France, and Bavaria challenged Maria Theresa's inheritance. The war, lasting until 1748, resulted in the loss of Silesia to Prussia but confirmed Maria Theresa's rule in most Habsburg lands.

Rama III succeeded his father, Rama II, as the third monarch of the Chakri dynasty. His reign marked a period of commercial expansion and cautious engagement with Western powers while maintaining Siamese sovereignty.

Rama III ordered the suppression of a rebellion led by Chao Anouvong of Vientiane. Siamese forces captured Vientiane, destroyed the city, and deported large populations to Siam, consolidating Siamese control over Lao territories.

Rama III signed the Burney Treaty with the British East India Company, establishing trade relations and defining spheres of influence in the Malay Peninsula. The treaty recognized Siamese suzerainty over Kedah while granting British commercial rights.

Rama III resisted Western demands for extraterritorial rights and military concessions, maintaining Siam's independence through diplomatic balancing. He also initiated limited modernization, including fortification upgrades and naval expansion.

Rama III launched a military campaign against Vietnam to assert Siamese influence over Cambodia. The war ended with a treaty that divided Cambodia into Siamese and Vietnamese spheres of influence, but failed to achieve lasting dominance.