The princely state of Alwar was founded by Pratap Singh, a Rajput of the Kachwaha lineage, in 1770. His son aided the British against the Marathas. After the battle of Laswari (1803) Alwar became the first state of Rajputana to sign a treaty of 'Offensive and Defensive Alliance' with the East India Company. A few years later, Bakhtawar Singh ventured an armed incursion into neighboring Jaipur, the senior Kachwaha state, and the erstwhile overlord of his predecessor. Bakhtawar Singh was defeated; a fresh engagement was made with him by the East India Company, prohibiting him from political intercourse with other states without British consent. During the Sepoy Mutiny of 1857, Raoraja Bane Singh sent a force consisting mainly of Muslims andRajputs, to relieve the British garrison in Agra. The Muslims deserted and the rest were defeated by the rebels. Pran Sukh Yadav, who fought beside Rao Tula Ram of Rewari in 1857, settled along with the kinsmen of dead soldiers at Village Nihalpura, BehrorTehsil, of Alwar District. Following the independence of India in 1947, Alwar acceded unto the dominion of India. On March 18, 1948, the state merged with three neighboring princely states (Bharatpur, Dholpur and Karauli) to form the Matsya Union. This union in turn merged unto the Union of India. On May 15, 1949, it was united with certain other princely states and the territory of Ajmer to form the present-day Indian state of Rajasthan
