Mazarinades are political pamphlets, published during the Fronde (1648-1652) in France. They occupied the research for decades, focused on different aspects of this vast corpus of more than 5’000 texts: let us quote for example the notion of burlesque, the mazarinades from Bordeaux, the question of rebellious woman, or the materiality of these pamphlets. This thesis focus on the question of ghosts and “living dead” presents in the mazarinades’ global corpus: how and why are theses entities used for political purposes, and possibly for crowds’ guidance? Our selection concentrate on a specific choice of prosopopoeia: in one hand, the dead speak as returning ghosts, with one point about distinguish “spirits” and “returning bodies” and the method of returns when possible. On the other hand, we focus on pamphlets where slingers make the living speaking as dead. This is the reason why we include indirect speeches: testaments, codicils, last reported words, eulogies, epitaphs, regrets, comfort letters etc. The analysis of this corpus, we call “from beyond the grave”, is first done in its materiality within the mazarinades’ global corpus. Then we classify each entity to understand whether it is part of the pagan, popular or religious beliefs and traditions about ghosts. Then we explore the literary aspect, in the hypothesis of an apologetic function. Afterward we slither to the rhetorical study of theses specters’ speeches to understand how they can manipulate and persuade public opinion. Finally, the pamphlets involving living people dreamt as dead will be the center of our attention in order to identify the cathartic function of this process.