The city has a history dating back to the Dvaravati period more than 1,000 years ago. According to the "Northern Chronicles," Lavo was founded by Phraya Kalavarnadishraj, who came from Takkasila in 648 CE.According to Thai records, Phraya Kakabatr from Takkasila (it is assumed that the city was Tak or Nakhon Chai Si) set the new era, Chula Sakarat in 638 CE, which was the era used by the Siamese and the Burmese until the 19th century. His son, Phraya Kalavarnadishraj founded the city a decade later. Lopburi, or Lavapura as it then was, was under the rule of the rising Angkor regime and became one of the most important centers in the Chao Phraya Basin from then on. Epigraphic evidence indicates that the dominant population of the city was Mon.