Charles Asselineau was one of Nadar's oldest friends. They had become close as young teens, at the Collège Bourbon, and were both part of Baudelaire's inner circle. Exceedingly well-read, Charles Asselineau, a supernumerary librarian at the Mazarine, the author, most notably, of Paradis des gens de lettres (Authors' Paradise)and of a href="https://gallica.bnf.fr/ark:/12148/bpt6k5494888s" target="_blank">L'Enfer du Bibliophile (The Bibliophile's Inferno), was close to the publisher Poulet-Malassis, who Baudelaire nicknamed "Poorly Perched Coco."
He and Nadar co-authored two short stories published in April and August 1846, respectively: "Death Cured" and "Paradise Found," which were later included in Quand j'étais étudiant (When I Was A Student). He belonged to the select group of publishers who did research for Nadar's Pantheon, which was originally meant to have an annex with a thumbnail biography of each person portrayed.
He was the best man at Nadar's wedding... although he didn't find that out until two weeks after the fact. The groom explained in a letter, "It's rather amusing that my best man only found out about my wedding two weeks after it was consummated, and via the invitation. I will explain all, dear friend, the next time we meet. For the moment, suffice to say that that I went to your home the day before, a Sunday, and that on the Monday morning, with the ceremony scheduled for noon, I didn't know at 11 A.M. if I woud be going through with it." (NAF 25007, fol. 8).