Suryavarman I is a campaign in Age of Empires II HD: Rise of the Rajas. It follows the story of the real-life Suryavarman I, the emperor of Khmer Empire from 1006 to 1050. The campaign covers how Suryavarman I comes to power before forming an alliance with the Chola Empire to confront the Kingdom of Tambralinga and the Srivijaya Empire, and expanding the Khmer Empire's territory westwards and eastwards, covering parts of the modern-day Thailand and Vietnam, before being posthumously enshrined as the Nirvanapada ("The king who went to Nirvana").
|“||It is the early 11th century and the Khmer Empire is in turmoil, torn apart by competing factions and surrounded by hostile neighbors. Only one prince, Suryavarman, has the courage and cunning to defeat his rivals and restore the Khmer to their former glory. Seizing the throne, however, is just the first of many tasks. Will Suryavarman muster the strength to expand his domain, overcome adversity, and create a timeless legacy as the king who attained Nirvana?||”|
|—In-game campaign description|
The Suryavarman I campaign consists of 5 scenarios. The player plays as the Khmer, and the player color is cyan.
The campaign is narrated by Sangrama, a Khmer general under the service of Suryavarman I's successor Udayadityavarman II, who tells the tale in front of captains under his command during a mission to suppress one of several rebellions that occurred during the course of Udayadityavarman II's reign.
- In the early version of the Suryavarman I campaign's intros and outros, Suryavarman I himself (along with various Khmers) are erroneously shown wearing Siamese (Thai) warrior clothing. This was corrected in later patches, although Suryavarman I in the expansion's cover and the in-game icons of various Khmer hero units are still shown wearing Siamese clothes.