Sri Indraditya

King Sri Indraditya (Thai: พ่อขุนศรีอินทราทิตย์; rtgs: Pho Khun Si Inthrathit; ?– 1270) ruled the Sukhothai Kingdom from the year 1238 to c. 1270. He is credited as the founder of the Phra Ruang Dynasty, itself credited as the first historical Siamese dynasty, having a double claim to this title: for being cradled precisely in the region designated by foreigners as "Siam" (Khmer: Syāiņ; Chinese: Sien, etc.), and for being the dynasty which freed the Thai principalities from the Cambodian yoke.

Initially known as Pho Khun Bang Klang Hao (Thai: พ่อขุนบางกลางหาว) interpreted as Lord Who Rules Sky, the controversy surrounding this names illustrates the limitations of epigraphy. This science studies inscriptions or epigraphs as writing, to identify graphemes, clarify their meanings, classify their uses according to dates and cultural contexts. Texts inscribed on steles are often missing the top or bottom portions, just where one would expect dates, complicating the drawing of conclusions about the writing and the writers. Specifically excluded from epigraphy are the historical significance of an epigraph as a document, and the artistic value of a literary composition. These complications led to the ruler in early life being simply Hao (หาว).

He was the chief of Bang Yang, a territory which belonged to the westernmost regions of the Khmer Empire at that time.:195–196 The territory now lies around the northern-central region of Thailand.

Khun Bang Klang Hao together with Khun Pha Mueang, the Lord of Rad, decided to rebel and declare independence from Angkor. The Khmer's control and its prohibitive taxes was a crucial motivating factor in the rebellion. Extensive Khmer preoccupation with great architectural works weakened the ability and readiness of Khmer defenses, indirectly aiding the rebellion. Khun Bang Klang Hao captured Si Satchanalai and gave it to Pha Mueang. Pha Mueang reciprocated by giving him Sukhothai.

Khun Bang Klang Hao, was then declared king at Sukhothai, taking a name of Sanskrit origin, Sri Intraditya translated as "The Sun King with the Power of 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 .

Sri Intraditya and his queen, Queen Sueang, had three sons. The eldest died at a young age, the second was named Ban Muang, and the third son defeated a Khmer prince in an encounter of mounted combat on elephants; he named this youngest son Ram Khamhaeng (Rama the Bold) in tribute to the feat. Sri Intraditya died around 1270, and was succeeded by his son Ban Muang.