centre of Lanna in 1797. King Bodawpaya was eager to regain Burmese control over Lanna. The Burmese invaded Chiang Mai in 1797 and 1802, in both occasions Kawila defended the city and Prince Sura Singhanat marched north to relieve Chiang Mai. The Siamese and Lanna forces then proceeded to capture Chiang Saen, the stronghold of Burmese authority in Lanna, in 1804, eliminating Burmese influence in Lanna. Siamese victories over the Burmese in Lanna allowed Siam to expand domination north towards the northernmost Tai princedoms: Keng Tung and Chianghung. Kawila of Chiang Mai sent forces to raid Keng Tung and Mong Hsat in 1802 and subjugated Mong Yawng, Mueang Luang Phukha, and Chiang Hung in 1805. In 1805, the Prince of Nan invaded the Tai Lue confederacy of Sipsongpanna and Chiang Hung surrendered. Prince Sura Singhanat of the Front Palace died in 1803. King Rama I appointed his own son Prince Itsarasunthon as the succeeding Prince of the Front Palace in 1806. King Rama I died in 1809 and Prince Itsarasunthon ascended to become King Rama II. King Bodawpaya then took the opportunity to initiate the Burmese invasion of Thalang on the Andaman Coast. Bangkok court sent armies to relieve Thalang but faced logistic difficulties before when Thalang fell to the Burmese in 1810. The Siamese were able to repel the Burmese from Thalang anyway. The Burmese Invasion of Phuket in 1809-1810 was the last Burmese incursion into Siamese territories in Thai history. Siam remained vigilant of prospective Burmese invasions through the 1810s. Only when Burma ceded Tenasserim to the British in the Treaty of Yandabo in 1826 in aftermath of the First Anglo-Burmese War that Burmese threats effectively ended. Eastern fronts: Laos, Cambodia, and Vietnam When the Siamese forces took Vientiane in 1779 in Thonburi period, all three Lao kingdoms of Luang Phrabang, Vientiane and Champasak came under Siamese domination. Lao Princes Nanthasen, Inthavong and Anouvong were taken as hostages to Bangkok. In 1782, King Rama I installed Nanthasen as King of Vientiane. However, Nanthasen was dethroned in 1795 due to his alleged diplomatic overtures with Tây Sơn dynasty in favor of Inthavong. When King Inthavong died in 1804, Anouvong succeeded as King of Vientiane. Yumreach Baen, a pro-Siamese Cambodian noble, staged a coup in Cambodia to overthrow and kill the pro-Vietnamese Cambodian Prime Minister Tolaha Mu in 1783. Chaos and upheavals that ensued caused Yumreach Baen to take young