Background
He was born at Châlons-sur-Marne (according to some at Chalon-sur-Saône), the son of Jean Jacob and Claudine Mareschal.
bibliographer Librarian writer
He was born at Châlons-sur-Marne (according to some at Chalon-sur-Saône), the son of Jean Jacob and Claudine Mareschal.
He published the first yearly lists of printed books While in Italy (1639) he took great interest in epigraphy, regretting the wholesale destruction of inscriptions in the catacombs. A lasting fruit of his sojourn in Rome was the completion and publication of the "Bibliotheca Pontificia", begun by Gabriel Naudé, a work not free from errors and mistakes.
On his return to France he obtained the post of librarian to Cardinal de Retz, and later on the dignity of royal councillor and almoner.
At a later period he became librarian to Achille de Harlay, first president of the parliament, in whose house in Paris he lived and finally died, aged 61.