扶南
The region also hosted a number of indigenous Austroasiatic-speaking and Malayo-Sumbawan-speaking civilisations. However, little is known about Thailand before the 13th century, as the literary and concrete sources are scarce and most of the knowledge about this period is gleaned from archaeological evidence. Similar to other regions in Southeast Asia, Thailand was heavily influenced by the culture and religions of India, starting with the Kingdom of Funan around the first century until the Khmer Empire. These "Indianised kingdoms" are composing of Dvaravati, Srivijaya and the Khmer Empire. E. A. Voretzsch believes that Buddhism must have been flowing into Thailand from India at the time of the Indian emperor Ashoka of the Maurya Empire and into the first millennium. Later Thailand was influenced by the south Indian Pallava dynasty and north Indian Gupta Empire.