Raja Nahar Singh was a prominent ruler of the princely state of Ballabgarh in present-day Haryana, India, during the 19th century. He is known for his leadership during the First War of Indian Independence in 1857, where he played a significant role in the uprising against British colonial rule. Nahar Singh was a descendant of the Suryavanshi dynasty and was respected for his efforts to modernize his state. His legacy includes contributions to local governance and infrastructure, which helped improve the lives of his subjects during his reign.