The capital of the Khmer Empire was Angkor, which is one of the largest pre-industrial cities. At its peak, the city supported one million people. This is reflected by two of their bonuses: Villagers can garrison inside Houses, and they do not need to build certain buildings to unlock other buildings or to advance to the next Ages. Like their Persian and Indian neighbors to the west, the Khmer Empire was known to employ war elephants widely for both tactical and logistical purpose. To reflect this, their Battle Elephants move faster and can be upgraded to deal more damage with the Tusk Swords unique technology.
Like their Chinese neighbor to the north, the Khmer Empire was also known to employ ballista technology. Consequently, their team bonus increases the range of Scorpions. In addition, Khmer also possess a ballista-carrying unique unit named Ballista Elephant. Furthermore, the number of missiles fired by both Ballista Elephants and Scorpions can be increased with the Double Crossbow unique technology.
In-game, Khmer units speak Khmer, the official language of modern Cambodia. An Austroasiatic language (related to the Vietnamese one), it is one of the few major languages of mainland Southeast Asia that is non-tonal (along with Malay). It shares similarities with Malay due to Indian and Sanskrit influence, e.g. Suosdey (Khmer) and Swasti (Malay).
Chah ចា៎ស់ (female) - Yes
Bat បាទ (male) - Yes
Tae neak mean lomdab? តើអ្នកមានលំដប់? - Do you have order?
Mean kar banhcheatinh? មានការបានជាទន? - Have orders?
Peak ban chea? ពក់បានជា? - Command?
Aroun suosdey អរុណសួរស្ដី - Good morning
Kniom neung teuw ti nouh ខ្ញុំនឹងទៅទីនេាះ - I will go there
When playing a random map game against the computer, the player may encounter any of the following Khmer AI characters:
Barom Reachea I (បរមរាមាធិបតី, also known as Dhamkat (ដំខាត់); reigned 1363 to 1370): One of the last kings of the Khmer Empire under the rule of the Thai Kingdom of Ayutthaya. He lead a rebellion against the Ayutthaya Empire before he died after being poisoned by his crucibles, leading to civil war and downfall of Khmer Empire. Father of Ponhea Yat.
Indravarman III (ឥន្ទ្រវរ្ម័នទី៣; reigned 1295 to 1308): King of the Khmer Empire, also titled Srindravarman (Khmer: ស្រីន្ទ្រវរ្ម័ន). Upon his ascent to power, he declared Theravada Buddhism as the state religion. Son-in-law of Jayavarman VIII.
Jayavarman II (ជ័យវរ្ម័នទី២; reigned 802 to 835): Founder of the Khmer Empire, he unified several parts of Khmer warlord states, marking the beginning of Angkor (great city) era in Cambodia history.
Jayavarman VII Mahaparamasaugata (ជ័យវរ្ម័នទី៧; 1125-1218, reigned 1181 to 1218): Regarded as one of the greatest kings in Khmer history and his reign is remembered as the "golden age" of the Khmer Empire. During his reign, he defeated the Champas, expanding his empire to its greatest extent, as well as building the Bayon Temple and hundreds of Buddhist temples.
Ponhea Yat (ពញាយ៉ាត; 1396-1463, reigned 1405 - 1463): The last king of the Khmer Empire who reigned at the age of 11, known by his reigning title as Barom Reachea II (បរមរាជាទី២). After the attack by the Ayutthaya Kingdom in 1436, he was forced to submit his kingdom to the Ayutthaya, ending the Angkor era and beginning the era of the Kingdom of Cambodia, which saw the conquest over Cambodia between the Siamese and the Vietnamese.
Rajendravarman II (ជេន្ទ្រវរ្ម័នទី២; reigned 944 to 968): King of the Khmer Empire, described as a great warrior-king who ruled his people kindly.
Sangrama (died in 1065): General under the service of Udayadityavarman II, he was credited for putting down several rebellions against Udayadityavarman II's rule.
Suryavarman I (សូរ្យវរ្ម័នទី១; reigned 1006 to 1050): First king of the united Khmer Empire. During his reign, he expanded his territory to the west to Lopburi, including the Menam basin in Thailand, and east into the Mekong basin. After his death in 1050, he gained the posthumous title Nirvanapada (the king who has gone to nirvana) for his Buddhist beliefs.
Suryavarman II Paramavishnuloka (សូរ្យវរ្ម័នទី២; reigned 1113 to 1145/1150): King of the Khmer Empire, widely regarded as the greatest king of Khmer Empire, well known for building the Angkor Wat, the largest religious monument in the world.
Udayadityavarman I (reigned for only few months in 1002): Succeeded the throne after Jayavarman V, Udayadityavarman I later dethroned by Jayaviravarman in 1002.
Yasovarman I (ព្រះបាទយសោវរ្ម័នទី១; reigned 889 - 910): King of the Khmer Empire. His reign is remarkable for various major construction projects, he built several water reservoirs around the new capital of Yasodharapura (later known as Angkor) as well as a hundred monasteries.
Despite the Khmer civilization depicted in Rise of Rajas are based on the Khmer Empire, their depiction in early version of campaign's cutscene erroneously depicting various Khmers (including Suryavarman I) to wearing Siamese (Thai) warrior costumes. this were later fixed in later version.
However, Suryavarman I depicted in expansion's cover and various Khmer hero unit in-game icons is still depicted as wearing Siamese clothes.
If a player picks the Khmer civilization, the bottom left and middle of the navigation bar will show the image of a human face and human-bird creature respectively. The face is based from the statues found in Bayon Temple depicting the face of Avalokitesvara, the Bodhisattva of compassion. The human-bird creature is known as Garuda, a mythical creature in Hindu mythology who served as a transport for Hindi god, Krishna. commonly depicted in Angkor reliefs as symbol of power.
Khmer Houses can be compared to AtlanteanManors from Age of Mythology: The Titans; both can garrison Villagers. However, Manors support more population, soldiers can garrison inside and also cost some gold alongside wood.
They are the only civilization outside most Age of Empires III civilizations (Asian ones, however, need to construct Wonders) that can advance to the next Age without requirements.
Although Khmer are one of the newest civilizations in Age of Empires II series, they have long been considered as the new potential addition by Ensemble Studio. During the development of The Conquerors expansion, Khmer - along with Tibetans and Koreans - were considered as one of the new factions to represent Far East region. Eventually, the developers picked Koreans because they were impressed with Turtle Ships and attracted by potential sales in South Korea.