1. Jean Lacave-Laplagne studied at the Ecole polytechnique, graduating in 1813 as an Artillery Lieutenant.

1. Jean Lacave-Laplagne studied at the Ecole polytechnique, graduating in 1813 as an Artillery Lieutenant.
Jean Lacave-Laplagne participated in Napoleon's Grande Armee in the last campaigns on the Empire.
Jean Lacave-Laplagne sat in the center, supported the government, and became noticed as a skilled speaker on a variety of topics.
On 15 April 1837 Jean Lacave-Laplagne was asked to take the Finance portfolio in the second ministry of Louis-Mathieu Mole.
Jean Lacave-Laplagne was reelected on 20 May 1837, and again on 4 November 1837 and 2 March 1939.
Jean Lacave-Laplagne returned to his seat in the Chamber with the conservative majority, and continued to participate in all discussions about public works and finance.
Jean Lacave-Laplagne was again given the Finance portfolio when Georges Humann died on 25 April 1842, and retained it until 8 May 1847.
Jean Lacave-Laplagne was involved in questions that included reducing the size of the army, police, patents, recruitment, conversion of pensions, postal reform, taxes on newspapers and periodicals, railway concessions, customs and salt taxes.
Jean Lacave-Laplagne was reelected on 9 July 1842 and 1 August 1846.
Jean Lacave-Laplagne died in Paris the next day, on 14 May 1849, from an attack of gout.