Before the 9th century, Lavo, together with other supra-regional settlements, such as Si Thep, Sema [th], Phimai, Nakhon Pathom, and others were the centers of the mandala-style polities of Dvaravati.

[5][6] Kalavarnadishraj was a son of Phraya Kakabatr, king of Takkasila (it is assumed that the city was Tak or Nakhon Chai Si)[7][8]: 29 [9] who set the new era, Chula Sakarat in 638 CE.

In the Northern Thai Chronicles, including the Cāmadevivaṃsa, Camadevi, the first ruler of the Mon kingdom of Hariphunchai, was said to be a daughter of a Lavo king.

In his diary, the monk Xuanzang referred to Dvaravati-Lavo as Tou-lo-po-ti, which seems to echo the name Dvaravati, as a state between Chenla and the Pagan Kingdom.

[14] Through royal relations, Isanavarman I of the Chenla Kingdom expanded Khmer influence to the Chao Phraya valley during the Mon dominance through his campaigns around the 7th century but did not exercise political control over the region.

The influence probably ended when Chenla faced the power struggle which led to the division of the kingdom in the late 7th century during the reign of Jayadevi.

[15] In the early Dvaravati period, the western Chao Phraya Valley was probably centered in Ayodhyapura (Si Thep) as mentioned in the Pali chronicles, Ratanabimbavamsa [th] and Jinakalamali.

[2] Ayodhyapura potentially began to decline in the mid-10th century as the Khmer inscription dating to 946 mentioned the Angkorian king Rajendravarman II won over Rāmaññadesa (country of the Mon) and Champa.

[20]: 51  But the conflict between these two polities may exist long before, as Woodward stated Jayavarman II, who established Kambujadesa and relocated the capital northward to Yaśodharapura in the mid 9th century,[3]: 87  formed an ally with the city-states in the Mun-Chi river basin, including Wen Dan, to counter Ayodhyapura's strength in the Pa Sak River basin in the west.

[10] According to the O Smach Inscription, after two years of the enthronement, King Rathasatkara or Trapaka (Thai: อัตราสตกะราช/ตราพกะ) of Haripuñjaya moved south aiming to seize Lavo.

However, the war between these two sister states spread to the southern kingdom of Tambralinga, King Jivaka or Suchitra (พระเจ้าชีวก/พระเจ้าสุชิตราช), took this advantage to occupy Lavo.

After failing to retake Haripuñjaya, King Rathasatkara moved south to settle in Phraek Si Racha (present-day Sankhaburi district).

[4]: 28  Lavo was said to be seized by Siamese from the western Menam Valley in the early 11th century[36] and by Tai's king Prom of Yonok in 1106, according to the local chronicles.

This resulted in the throne of Lavo's Lavaburi being vacant from 1087 to 1106, Si Satchanalai king, Kraisornrat (ไกรศรราช) who is of Mon's Chaliang and Tai's Chiang Saen lineages, took over the seat.

An attempt to re-expand influence to Lavo by the Angkor occurred in 1181 when Jayavarman VII appointed his lineage Narupatidnavarman to govern Lavapura.

[31]: 30 [a] The majority of Ayodhya's inhabitants are supposed to have migrated from Ayodhyapura following its fall in 946 as well as residents from Lavapura who fled after the city was destroyed by Angkor in 1001.

[16] This large population, coupled with its location that controlled the trade routes of the Chao Phraya River basin, led to the city's rapid growth[42]: 5–7  and was later designated as the new capital of Lavo in the 1080s.

From about the same period there is also a well-known bas relief panel of Angkor Wat showing mercenaries of the Khmer army, who are identified as syam-kuk, perhaps "of the land of Siam."

However, since he had no male heir, he had his only daughter marry Sai Nam Peung (สายน้ำผึ้ง),[2]: 103–4  son of Kraisornrat (ไกรศรราช) who was of Mon's Chaliang and Tai's Chiang Saen lineages and served as the Lavapura king at that time.

[50] According to The Customs of Cambodia written by Zhou Daguan as an official delegation sent by the Yuan Dynasty to Angkor from 1296–1297, the Siamese people exerted significant influence over Lavo's Lavapura and appeared in huge numbers in the Angkorian city of Yasodharapura.

[56]: 28  Van Vliet's chronicles, a seventeenth-century work, stated that King Uthong was a Chinese merchant who established himself at Phetchaburi before moving to Ayutthaya.