Angkor Dynasty Territorial Integration and Hydraulic Expansion in the 1070s

Timeline

1. 1070–1072Angkor · CambodiaAfter Suryavarman I's death, the throne changed hands several times, but the vassal states and administrative networks he had conquered were still maintained by the Angkor royal house. New rulers devoted themselves to consolidating central suzerainty over local governors (holders of the title raja) and preventing vassal defection.
2. 1073–1077Irrigation zones around Tonlé Sap · CambodiaThe royal house continued expanding reservoirs, canals, and baray systems beyond Angkor's core, bringing more arable land into the state's tax and corvée networks. Hydraulic expansion both raised food output and strengthened administrative control over local populations.
3. 1075–1079Western and northern frontiers of the Angkor Empire · IndochinaThrough military action and marriage alliances, Angkor continued integrating vassal states of the western Mon city-states and northern Thai settlements. Royal expeditions and investiture ceremonies recorded in inscriptions show that the empire's borders were still expanding outward in the 1070s.