SuvacanarÃÂja () or PasujakumÃÂra () was an 11th-century Mon monarch mentioned in the Northern Chronicle as the ruler of Mueang Chaliang (Si Satchanalai). He ascended the throne following the death of his elder mixed MonâÂÂTai brother, Arunaraja, in 1052. SuvacanarÃÂja was the youngest son of the second consort of King Abhayakamini of Sukhothai. Similar to his brother, he married a Chinese princess named Pasujadevë. The couple had one daughter named Padumadevë (), and two sons, Dharmatriloka and Baramatriloka. SuvacanarÃÂja is recorded in the chronicle to have had a long reign, died at the age of 160, and was succeeded by his elder prince, Dharmatriloka, around the mid 12th century.
During SuvacanarÃÂjaâÂÂs reign, the authority of Chaliang extended, through royal relations established by his father, northward to the Tai polities of and . The principal northern administrative center was located at or Kampoá¹Âanagara (), governed by his brother á¹ÂddhikumÃÂra (). Several subordinate towns were recorded under this jurisdiction, including Mueang Khiri (), Mueang Sawangkhaburi (), Mueang Yangkhiri (), Nakhon Khiri (), Mueang Khonkiri (), Mueang Lek (), Mueang Singthao (), and Mueang Nakhon (; identified with Lampang). SuvacanarÃÂjaâÂÂs reign was characterized by the consolidation of the polity through the fortification of the capital, the enactment of administrative laws, and the enhancement of state infrastructure. It is further recorded that he submitted a royal request to his father-in-law, the Emperor of China, for ten craftsmen skilled in casting artillery. These craftsmen subsequently produced approximately 120 cannons and 500 muskets (or arquebuses) to strengthen the kingdomâÂÂs military capability.
SuvacanarÃÂja later confronted an invasion led by à Ârëdharmatripiá¹Âaka of Tai's Yonok Chiang SaenâÂÂidentified in some accounts as King Phrom, who was the only Tai ruler recorded to have launched a campaign into the Menam Basin. The conflict concluded with a peace agreement, through which SuvacanarÃÂja gave his only daughter, Padumadevë, in marriage to à Ârëdharmatripiá¹Âaka. The two polities then became allies. Their union produced two sons: Kesariraja of Lavo and Jatisakara (), who later succeeded his father at Chiang Saen.
During this period, the Monic sister polity to the west, the Thaton kingdom, is recorded to have fallen under the Pagan in 1057.