Translations for prop in French

Here are paragraphs from public domain books translated:

"No, monsieur; I speak of the prop of the state, of my only servant, of my only friend--of the cardinal."	— Non, monsieur ; je veux parler du soutien de l’État, de mon seul serviteur, de mon seul ami, de M. le cardinal.
The Three Musketeers, by Alexandre Dumas	Les Trois Mousquetaires, de Alexandre Dumas