Around 660 - In an area that today is Thai territory, another Mon kingdom, called Haripungaya, grows to power. The place is later named Lamphun (now a Thai provincial capital).
706 - The Chenla Kingdom of the Khmers splits into two parts, the upper Chenla Kingdom and the lower Chenla Kingdom.
857 - Chenla is reunited through a marriage of members of the two formerly competing royal families, forming a new powerful Khmer kingdom.
889 - The first city of Angkor in the Khmer Empire is founded by King Yasoriaman I.
1007 - The Dvaravati Kingdom of the Mons falls to the Khmer who expand from their traditional area, roughly present-day Cambodia, in two directions: towards the west (regions settled by Thais) and towards the east (regions settled by Annamites, the predecessors of today’s Vietnamese). For much of the following centuries, Khmer kingdoms will be an efficient buffer between the Thais and the Annamites (Vietnamese). The Thais will by and large never occupy the Annamite states and the Annamites likewise never Thailand. In a similar manner, Thai kingdoms will by and large form an efficient buffer between the Khmers and the Burmese. Though excursions of Burmese armies into the Khmer kingdoms and Khmer excursions into Burmese territories occur when Thai kingdoms are weak, neither the Burmese nor the Khmers will establish rule over the other’s territories beyond what can be considered episodes in history. Those ethnic groups with settlement areas between the Thais and Burmese, such as the Mons (ethnically related to the Khmers) and the Shans (ethnically related to the Thais) will only be able to establish temporarily independent kingdoms of their own and become more or less absorbed alternately by Thai and Burmese states. Most of these Mon and Shan kingdoms and principalities stretch over areas which are today Burmese.
1044-1077 - The Khmer Empire on what is today mostly Thai territory weakens when Burmese King Anurudh attacks it and establishes Burmese rule over most regions of what is now Thailand and Burma.
1077 - When King Anurudh dies, Burma is again divided. This gives the Khmers a chance to expand again their empire over wide areas of what is now Thailand. The Khmer governor for the area that is today northern Thailand resides in Sayam (later, and until now, Sukhothai); the Khmer governor for the area that is presently southern Thailand resides at Lavo (later, and until now, Lopburi).
1098 - Birth of Prince Phrom to the king of Chiang Saen. Chiang Saen is at that time a small vassal principality of the Khmer empire. As a young man, Prince Phrom leads a revolt against the Khmer rule and succeeds. Subsequently, he expands his principality as far as Vientiane (present-day capital of Laos) in the east and Chiang Mai in the west.
1117 - Prince Phrom founds the city of Jaiprakarn (later to be known as Fang).
1177 - Phrom dies at 79, having ruled Jaiprakarn for 59 years. Leadership over Jaiprakarn is transferred to his son, Jaisiri.
1188 - A Mon army invades Jaiprakarn. Jaisiri knowing the small population’s inability to repel the attack, moves his people to the south where they found the town of Fab (now known as Kamphaeng Phet).
1200-1205 - King Jaisiri sends diplomatic missions to China seeking political recognition and trade. Trade with China begins through horse caravans, carrying goods back and forth along the hilly trails between south China and the northern Thai Kingdom.
1220 - King Yasoriaman VII of Angkor dies and the power of the Angkoran Khmers wanes.
