Origin Bang Klang Hao was born to Sirisudhārājadevī (), a queen consort of
Candraraja, who relocated the seat from
Kamphaeng Phet to Sukhothai. whom certain historians have identified with the Khmer monarch
Suryavarman II. However, such an assumption appears chronologically inconsistent when juxtaposed with the genealogical account of an early Siamese royal line that ruled
Xiū Luó Fēn, situated in the
Phraek Si Racha region. The first monarch of this lineage,
Visnuraja, who likewise claimed descent from King Phatumsuriyawong, By 1180 CE, the domain of
Phraek Si Racha region had come under a royal house that may have been connected to
Angkor and was later re-established as
Chen Li Fu. During this period,
Candraraja, a descendant of the Phrak Si Racha line and father of Si Inthrathit, ruled at
Kamphaeng Phet before transferring the royal seat to
Sukhothai. although the
Ayutthaya Testimonies place it to the east of
Sankhaburi. which had previously served as the power base of his kinsman,
Pra Poa Noome Thele Seri. During his tenure there, Si Intharathit was potentially supported by
Tai Yuan refugees who had fled to the region following the fall of
Yonok. He also married , a Tai Lueang (ไทเลือง) princess and daughter of
Sri Naw Nam Thum, the ruler of Mueang Rat (), situated in either modern
Lom Sak district, to the east of Mueang Bang Yang, or at the ancient in modern
Uttaradit province. This Tai Lueang polity subsequently expanded its sphere of influence into
Mueang Chaliang, which had been under the mixed
Monic–Chinese
Haripuñjaya dynasty, during the waning reign of
Rajadhiraj II in the early 13th century. After consolidating control over
Mueang Chaliang, the Tai Lueang monarchs, led by
Sri Naw Nam Thum and his son
Pha Mueang, extended their dominion southward toward
Sukhothai in 1219, overthrowing the
Mon ruler
E Daeng Phloeng. However, the remnants of the older Monic aristocracy, led by
Khom Sabat Khlon Lamphong, staged a successful revolt, reclaiming control of Sukhothai. In response, a coalition of Siamese forces led by a local chieftain, Bang Klang Hao—later known as
Si Intharathit—recaptured the city and re-established it as an autonomous Siamese polity in 1238. Si Intharathit was militarily aided by his brother-in-law,
Pha Mueang, a son of
Sri Naw Nam Thum.
Pha Mueang was given
Mueang Chaliang following this event. Pho Khun Bang Klang Hao was then declared king at Sukhothai, taking a regnal name of Sanskrit origin, Si Inthrathit, translated from
Adityan Indra. His skill and bravery greatly impressed the people of the kingdom, who thus conferred him the title
Phra Ruang (glorious prince). This title was given to all subsequent rulers of Sukhothai, thus giving rise to the first Thai royal dynasty of Phra Ruang. Si Inthrathit and his queen, Sueang, had three sons. The eldest died at a young age, and the second was named Ban Mueang. His third son defeated a Khmer prince on elephants in mounted combat; he named this youngest son
Ram Khamhaeng (Rama the Bold) in tribute to the feat. Si Inthrathit died around 1270, and was succeeded by his son
Ban Mueang. ==Notes==