What is "suhaldev"

Suhaldev is a semi-legendary Indian king from Shravasti, who is said to have defeated and killed the Ghaznavid general Ghazi Saiyyad Salar Masud in the early 11th century. He is mentioned in Mirat-i-Masudi, a 17th-century Persian-language historical romance. Since the 20th century, various Hindu nationalist groups have characterized him as a Dalit Hindu king who defeated a Muslim invader.