Dhammikaraja

Dhammikaraja () was the fourth sovereign of Xiān at Ayodhya. His name is attested in the Ayutthaya Testimonies , the Northern Chronicle, and the 1225 Ayutthaya Royal Miscellaneous Laws (Phra Aiyakan Betset; or ). He ascended the throne in 1165, succeeding his father, Sai Nam Peung, and reigned until around 1225. The extant historical sources provide limited detail regarding his reign. Nevertheless, it is generally characterized as a period of economic prosperity and the flourishing of Theravāda Buddhism, as evidenced by the construction of several religious monasteries attributed to his patronage. Dhammikaraja's principal consort was Queen Siripajarajadevi (); however, no record survives concerning royal offspring. According to the Ayutthaya Testimonies, he ascended the throne at the age of fifteen, which suggests a birth year of approximately 1150.

Concurrently, during Dhammikaraja's reign, another dynastic line emerged, consisting of the brothers Pra Poa Noome Thele Seri and Uthong I, who originated in Lavo and established themselves in Soucouttae/Locontàï in the 1150s. By 1157, they had shifted southward and assumed control over Singburi. From this base, the lineage progressively consolidated authority over several polities in the western Menam basin: Suphannaphum in 1163 and Phrip Phri in 1188. Dhammikaraja was then succeeded by Pra Poa Noome Thele Seri's prince, Uthong II. Some scholars further suggest that Uthong II may have entered into a matrimonial alliance with Dhammikaraja’s daughter.

In the year 1182, during the reign of King Lý Cao Tông of Đại Việt, Xiān is recorded to have dispatched a tributary mission to the royal court, thereby affirming diplomatic engagement between the two realms.

An alternative tradition recorded by Jeremias van Vliet describes him as a Chinese prince who had been exiled from China.  However, this account appears to conflict with other traditions: both the Northern Chronicle and the Ayutthaya Testimonies state that the father-in-law of Uthong II—whom some scholars have identified with Dhammikaraja—was a descendant of Sindhob Amarin (r. 937–996).