- Born on March 27, 1818
- Deceased on November 27, 1892 in Toulouse, at the age of 74 years
Parents
- Auguste de Lacoste (1772 - 1832), baron de Belcastel, capitaine de cavalerie
- Angélique d'Argout ( - 1869)
Family
- Married on May 10, 1848, with Henriette de Touchebœuf (1827 - 1887), issuing
- Joseph (1860 - 1942)