The United States of Matsya also called Matsya Union was a State of India which was formed on March 17, 1948 by the merger of four erstwhile princely states, Alwar, Bharatpur, Dholpur, and Karauli after accession. Shobha Ram was the first and last chief minister of the State from 18 Mar 1948 till 15 May 1949. On May 15, 1949, the Matsya Union was merged with Greater Rajasthan, to form the United State of Greater Rajasthan, which later became the state of Rajasthan on January 26, 1950.