Short answers, pulled from the story.
King Jaya Indravarman IV led the Champa fleet that invaded and pillaged the Khmer capital of Yasodharapura. This attack resulted in the death of King Tribhuvanadityarman and four years of Cham occupation without resistance.
Jayavarman VII built 102 hospitals during his reign to serve the physical needs of common people who had suffered under war. These structures were part of a centralized state power focused on welfare and required labor from thousands of workers.
The outer walls of the Bayon feature bas reliefs showing warfare, daily life, and a naval battle fought on Tonlé Sap. This conflict marked the turning point for the Khmer Empire after Jayavarman VII emerged from obscurity to lead a counterattack.
An inscription indicates that 80,000 people were assigned to maintain Ta Prohm at one time following its dedication by Jayavarman VII in 1186. This workforce included 18 high priests and 615 female dancers alongside other staff.
Jayavarman VII erected Buddha stone images called Jayabuddhamahanatha in 23 towns including Lavo, Svarnapura, and Sambukapattana. His devotion to Buddhism motivated these dedications throughout the empire while Princess Jayarajadevi and her sister Indradevi are thought to have inspired this focus.