Pho Khun Sri Indraditya (also Sri Intraditya, Si Inthratit) is said, according to the Number One Stone Inscription, to be the founder of the so-called Phra Ruang Clan, or 'dynasty' of the Sukhothai Kingdom

Sukhothai kingdom

The Sukhothai Kingdom ) was an early kingdom in the area around the city Sukhothai, in north central Thailand. The Kingdom existed from 1238 till 1438...

. He ruled between the years of 1238 and circa 1270 C.E.

Initially, he served as the 'vassal' lord of Bang Yang, a territory which belonged to the westernmost regions of the Khmer

Khmer Empire

The Khmer Empire was one of the most powerful empires in Southeast Asia. The empire, which grew out of the former kingdom of Chenla, at times ruled over and/or vassalized parts of modern-day Laos, Thailand, Vietnam, Burma, and Malaysia. Its greatest legacy is Angkor, the site of the capital city...

 Angkor kingdom in that time, and now lies in the northern-central region of Thailand

Thailand

Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...

. He assumed the name Khun Bang Klang Thao, or simply Hao, during his time in this office. Together with the Governor of Rad

RAD

Rad may mean:* Rad , a villainous character in AC Comics's "Femforce"* Rad , a 1986 release about a young BMX rider* Rad , several fictional characters in the Transformers toy line...

, Khun Pha Mueang, he declared independence from Angkor's control and its prohibitive taxes, a crucial motivating factor in the revolt. Extensive Khmer preoccupation with great architectural works weakened the ability and readiness of Khmer defenses, greatly aiding the rebellion indirectly.

Initially Khun Bang Klang Thao, or Khun Bang Klang Hao, Lord Who Rules Sky, was then declared the king of the new kingdom, taking a name of Sanskrit

Sanskrit

Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

 origin, Sri Intraditya, "The Sun King with the Power of Indra

Indra

' or is the King of the demi-gods or Devas and Lord of Heaven or Svargaloka in Hindu mythology. He is also the God of War, Storms, and Rainfall.Indra is one of the chief deities in the Rigveda...

". His skill and bravery greatly impressed the people of the kingdom, who thus conferred the title Phra Ruang (Glorious Prince). This surname was given to all kings of Sukhothai to follow, giving rise to the first Thai dynasty, the Phra Ruang.

Sri Intraditya and his queen, Queen Nang Suang, 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

Rama

Rama or full name Ramachandra is considered to be the seventh avatar of Vishnu in Hinduism, and a king of Ayodhya in ancient Indian...

 the Bold) in tribute to the feat. Sri Intraditya died around 1270 C.E., and was succeeded by his son Ban Muang.