Founded in 1770 CE by Pratap Singh Naruka, its reigning ruler, Maharaja Sir Tej Singh Prabhakar Bahadur, signed the accession to the Indian Union on 7 April 1949.

[citation needed] Alwar State was established in 1770,by a Kachwaha Rajput named Pratap Singh Naruka.

Following the Partition of India in 1947, Alwar acceded unto the dominion of India with the state's forces participating in and encouraging the killings and expulsion of its Muslim population.

[1][failed verification] On 18 March 1948, the state merged with three neighbouring princely states (Bharatpur, Dholpur and Karauli) to form the Matsya Union.

The Alwar City Palace, or Vinay Vilas, built in 1793 by Raja Bakhtawar Singh, is now a district administrative office.