Baramaraja (Thai: บรมราชา), of mixed Siamese Mon–Chinese heritage,^[b] became the ninth monarch of Xiān at Ayodhya in 1310 following the death of his elder brother, Dhammaraja.^[3] His reign, extending from 1310 to 1344,^[3] was characterized by the revival of expansionist military activity, in continuity with the policies of his father-in-law, Suvarnaraja. In 1313, only a few years after his accession, he launched a protracted two-year campaign of invasion against Champa. This enterprise ultimately proved unsuccessful, as Champa later received military support from the emperor of Đại Việt.^{[4]:line 148[5]: 122–123}

Baromarāja was the second son of Dharmatriloka, king of Si Satchanalai. His principal consort was Sunandhadevī, the younger daughter of the 7th Ayodhya monarch Suvarnaraja.^{[2]: 69–71} Upon his death in 1344, he was succeeded by his only son, Varashreṣṭhakumāra (วรเชษฐกุมาร), who ascended the throne as Uthong V or Ramathibodi I, subsequently becoming the first king of the Ayutthaya Kingdom in 1351.^[3]

During the reign of Baromaraja, tributary missions were dispatched to the Yuan dynasty in 1314, 1319, and 1323.^[6]: 39 Subsequent embassies were recorded under the designations Xiānluó hú (暹羅斛) and Xiānluó 暹羅), appellations that referred to the polity later identified as the Ayutthaya Kingdom.^[6]: 40 In the period between 1334 and 1336, during the invasion of Ai Lao [zh] by the Trần dynasty, Xiān, together with other regional polities, rendered tribute to Đại Việt, as recorded in the Khâm định Việt sử Thông giám cương mục.^[7] Trade relations with China, Kula, Vilanda, Japan, India, and others, were recorded.^[8]