Angkor's Diplomatic Failure: Why the Khmer Lost Their Allies

While climate and water management often dominate discussions of Angkor's decline, this episode explores a critical political failure that historians have increasingly recognized as decisive. By the late fourteenth century, the Khmer Empire under King Ramathibodi I of Ayutthaya was not just a military rival but a diplomatic predator that systematically dismantled Angkor’s network of tributary states in the Khorat Plateau and beyond. We examine how the shift from Hindu-Buddhist syncretism to Theravada Buddhism in Siam created a religiously charged legitimacy that undermined the Khmer devaraja cult. Using accounts from Zhou Daguan and archaeological evidence from Phimai and Lopburi, we trace the specific betrayals by former vassals like Champa and the Lao principalities who switched allegiance. This isn't just about battles; it is about the erosion of soft power, the breakdown of trade routes controlled by the Tonle Sap, and how a loss of prestige turned the Khmer court inward, isolating them from the very regional order they once commanded. #KhmerEmpire #AngkorCollapse #AyutthayaKingdom #RamathibodiI #TheravadaBuddhism #Devaraja #ZhouDaguan #TonleSap #Champa #LaoPrincipalities #SoutheastAsianHistory #Diplomacy #PhimaiTemple #Lopburi #KhoratPlateau #SrivijayaDecline #FexingoHistory #History Keep every episode free: buymeacoffee.com/fexingo