Translations for historiographer in French

Here are paragraphs from public domain books translated:

And that is how I made the acquaintance of Arsene Lupin. That is how I learned that Jean Daspry, a member of my club, was none other than Arsene Lupin, gentleman-thief. That is how I formed very agreeable ties of friendship with that famous man, and, thanks to the confidence with which he honored me, how I became his very humble and faithful historiographer.

Et voilà comment j’ai connu Arsène Lupin. Voilà comment j’ai su que Jean Daspry, camarade de cercle, relation mondaine, n’était autre qu’Arsène Lupin, gentleman-cambrioleur. Voilà comment j’ai noué des liens d’amitié fort agréables avec notre grand homme, et comment, peu à peu, grâce à la confiance dont il veut bien m’honorer, je suis devenu son très humble, très fidèle et très reconnaissant historiographe.

The Extraordinary Adventures of Arsene Lupin, Gentleman Burglar, by Maurice Leblanc

Arsène Lupin gentleman-cambrioleur, de Maurice Leblanc