Le Valentin is reasonably identified as the son of a Valentin de Boulongne of Coulommiers-en-Brie. He was in Rome by 1620; he was influenced by Manfredi and
Caravaggio.
Most of the attributions to him are traditional, but
stylistically coherent and convincing. His 'Martyrdom of Saints Processus and Martinian' (Vatican, Rome) is documented as of 1629-30. He died in Rome in 1632.