Khmer Empire in the context of "Angkor Wat"

Cambodia, officially the Kingdom of Cambodia, is a country in Mainland Southeast Asia. It is bordered by Thailand to the northwest, Laos to the north, and Vietnam to the east, and has a coastline along the Gulf of Thailand in the southwest. It spans an area of 181,035 square kilometres (69,898 square miles), dominated by a low-lying plain and the confluence of the Mekong river and Tonlé Sap, Southeast Asia's largest lake. It is dominated by a tropical climate. Cambodia has a population of about 17 million people, the majority of which are ethnically Khmer. Its capital and most populous city is Phnom Penh, followed by Siem Reap and Battambang.

In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name "Kambuja". This marked the beginning of the Khmer Empire. The Indianised kingdom facilitated the spread of first Hinduism and then Buddhism to Southeast Asia and undertook religious infrastructural projects throughout the region, the most famous of which is Angkor Wat. In the 15th century, it began a decline in power until, in 1863, Cambodia became a French protectorate. Following Japanese occupation during World War II, Cambodia declared independence from France in 1953. The Vietnam War embroiled the country in civil war during the 1960s, culminating in a 1970 coup which installed the US-aligned Khmer Republic and the takeover of the communist Khmer Rouge in 1975. The Khmer Rouge ruled the country and carried out the Cambodian genocide from 1975 until 1979, until they were ousted during the Cambodian–Vietnamese War. Peace was restored by the 1991 Paris Peace Accords and subsequent United Nations peacekeeping mission, establishing a new constitution, holding the 1993 general election, and ending long-term insurgencies. The 1997 coup d'état consolidated power under Prime Minister Hun Sen and the Cambodian People's Party (CPP).

Thailand, officially the Kingdom of Thailand, and formerly known as Siam until 1939, is a country located in mainland Southeast Asia. It shares land borders with Myanmar to the west and northwest, Laos to the east and northeast, Cambodia to the southeast, and Malaysia to the south. Its maritime boundaries include the Gulf of Thailand and the Andaman Sea, as well as maritime borders with Vietnam, Indonesia, and India. Thailand has a population of nearly 66 million people, covers an area of approximately 513,115 km (198,115 sq mi). The country's capital and largest city is Bangkok.

Archaeological evidence indicates that humans have inhabited the area of present-day Thailand for at least 40,000 years. Indigenous ethnic groups include the Mon, Khmer, and Malay people. The Tai people are believed to have originated from the Điện Biên Phủ region since the 5th century and began migrating into the territory of modern Thailand between the 8th and 10th centuries origin of the Tai people. During the classical historical period, major kingdoms such as Sukhothai, Lan Na, and Ayutthaya were established. The Sukhothai Kingdom is regarded as the beginning of Thai history, while the Ayutthaya Kingdom, founded in 1350 CE, became a regional power replacing the Khmer Empire. European contact began in 1511 CE when Portuguese envoys arrived in Ayutthaya. The Ayutthaya Kingdom flourished until its complete destruction during the 1765–1767 Burmese–Siamese War by the Burmese forces under the Konbaung dynasty in 1767.

Srivijaya (Indonesian: Sriwijaya), also spelled Sri Vijaya or Sriwijaya, was a Malay thalassocratic empire based on the island of Sumatra (in modern-day Indonesia) that influenced much of Southeast Asia. Srivijaya was an important centre for the expansion of Buddhism from the 7th to 11th century AD. Srivijaya was the first polity to dominate much of western Maritime Southeast Asia. Due to its location, Srivijaya developed complex technology using maritime resources. In addition, its economy became progressively reliant on the booming trade in the region, thus transforming it into a prestige goods-based economy.

The earliest reference to it dates from the 7th century. A Tang dynasty Chinese monk, Yijing, wrote that he visited Srivijaya in 671 for six months. The earliest known inscription in which the name Srivijaya appears also dates from the 7th century in the Kedukan Bukit inscription found near Palembang, Sumatra, dated 16 June 682. Between the late 7th and early 11th century, Srivijaya rose to become a hegemon in Southeast Asia. It was involved in close interactions, often rivalries, with the neighbouring Mataram Kingdom, Khmer Empire and Champa. Srivijaya's main foreign interest was nurturing lucrative trade agreements with China which lasted from the Tang to the Song dynasty. Srivijaya had religious, cultural and trade links with the Buddhist Pala of Bengal, as well as with the Islamic Caliphate in the Middle East.

Siem Reap (Khmer: សៀមរាប, Siĕm Réab [siəm riəp]) is the second-largest city of Cambodia, as well as the capital and largest city of Siem Reap Province in northwestern Cambodia.

Siem Reap possesses French-colonial and Chinese-style architecture in the Old French Quarter and around the Old Market. The city is a major hub for tourism in Cambodia due to its close proximity to the ancient temples of Angkor constructed during the Khmer Empire. In and around the city there are museums, traditional Apsara dance performances, a Cambodian cultural village, souvenir and handicraft shops, silk farms, rice paddies in the countryside, fishing villages and a bird sanctuary near Tonlé Sap, and a cosmopolitan drinking and dining scene.

Battambang (Khmer: បាត់ដំបង, UNGEGN: Bătdâmbâng [ɓatɗɑmɓɑːŋ]) is the capital of Battambang province and the third largest city in Cambodia. The city is situated on the Sangkae River, which winds its way through the province.

Battambang was founded in the 11th century by the Khmer Empire. It later became a major commercial hub and the capital of the Siamese province of Inner Cambodia. It was reintegrated into Cambodia during French colonisation. During the 20th century, Battambang was Cambodia's second largest city, but it was overtaken by the growth of Siem Reap. It was impacted by conflict and genocide in the 20th century, with the city forcibly evacuated during the Democratic Kampuchea period. It was also the site of fighting during the Khmer Rouge insurgency until the 1990s.

Jayavarman II (Khmer: ជ័យវរ្ម័នទី២; c. 770 – 850, reigned c. 802–850) was a Khmer prince who founded and became the ruler of the Khmer Empire after unifying the Khmer civilization. The Khmer Empire was the dominant civilization in mainland Southeast Asia from the 9th century until the mid-15th century. Jayavarman II was a powerful Khmer king who declared independence from a polity inscriptions named "Java", which most probably refers to the island of Java in the Indonesian archipelago. Jayavarman II founded many capitals such as Mahendraparvata, Indrapura, Amarendrapura, and Hariharalaya. Before Jayavarman II came to power, there was much fighting among local overlords who ruled different parts of Cambodia, and much of the area fell under the orbit of the Shailendra dynasty of Srivijaya. As a child, Jayavarman II had been held in captivity or exile in Java, and was installed as Java's vassal around 800. By starting off with small weak kingdoms, he built himself up from there eventually leading to the Khmer Empire. No inscriptions by Jayavarman II have been found. Later kings of the Khmer Empire described him as a warrior and the most powerful king from that time frame that they could recall. Historians formerly dated his reign as running from 802 CE to 835 CE.

Chenla or Zhenla (Chinese: 真臘; pinyin: Zhēnlà; Wade–Giles: Chen-la; Khmer: ចេនឡា, romanized: Chénla, Khmer pronunciation: [ceːnlaː]) is the Chinese designation for the vassal of the kingdom of Funan preceding the Khmer Empire that existed from around the late 6th to the early 9th century in Indochina. The name was still used in the 13th century by the Chinese envoy Zhou Daguan, author of The Customs of Cambodia. It appears on the Mao Kun map. However, modern historiography applies the name exclusively to the period from the late 6th to the early 9th century. This period of Cambodian history is known by historians as the Pre-Angkor period. It is doubted whether Chenla ever existed as a unitary kingdom, or if this is a misconception by Chinese chroniclers. Most modern historians assert that "Chenla" was in fact just a series of loose and temporary confederations of principalities in the pre-Angkor period.