In 1850, Cavour became famous because he advocating the "Siccardi Law" that diminished the privileges of the Catholic clergy. In the same year, the Prime Minister of the Kingdom of Sardinia, Massimo D'Azeglio, chose him as Minister of Agriculture, Trade and Navy. Later he also became Minister of Finance. After D'Azeglio resigned on November 4, 1852, Cavour became Prime Minister of the Kingdom of Sardinia.