Son of a wealthy family from Toulouse, Louis de Planet signed up for the École des Beaux-Arts in 1833 after completing his law degree.
He became a friend of Romain Cazes, one of Ingres’ students. But once he reached Paris, he selected Delacroix’s studio. The painter had just opened a studio on rue Neuve-Guillemin to train students as future assistants to help with the decorative projects at the library of the Palais Bourbon - which Louis de Planet discussed nearly every day, from 1841 to 1844, in his valuable Souvenirs des Travaux de Peinture avec M. Eugène Delacroix.
A great admirer of the master painter, who recognized in him "superior qualities, but a total lack of self-confidence," Louis de Planet died in 1876, virtually forgotten.