Adītaraj

Adītaraj (Thai: อาทิตยราช) is mentioned in the Pali Ratanabimbavamsa (The Chronicle of the Emerald Buddha) as a monarch of the early Siamese polity. He is recorded as ruling over Ayojjhapura, a polity further corroborated by the Pali chronicle Jinakalamali, which situates it within the historical region of Rāmaññadesa. According to these sources, Ayojjhapura functioned as the metropolitan center located north of Lavo's Lavapura. Based on this geographical description, Thai historians have proposed an identification of Ayojjhapura with Si Thep, which is recorded in Chinese sources as Qiān Zhī Fú.

The Ratanabimbavaṃsa further records that Adītarāja launched an invasion of Inthapatnakhon (อินทปัตย์นคร), identified as lying to the east of modern Sankhaburi,  following the demise of its great ruler. As a result of this campaign, Adītarāja is said to have successfully obtained the Emerald Buddha. On this basis, his reign may tentatively be placed between the late 8th and the early 9th century. He was thereafter possibly succeeded by Bhagadatta in 859.