Libelle (literary genre)

A libelle is a political pamphlet or book which slanders a public figure. "Libelles" held particular significance in France under the Ancien Régime, especially during the eighteenth century, when the pamphlets’ attacks on the monarchy became both more numerous and venomous. In recent years, cultural historian Robert Darnton has written on the "libelles", arguing for the subversive power that the "libelles" of the late eighteenth century exercised in undermining monarchical authority.
Etymology.
The French word "libelle" is derived from the Latin "libellus", for “small book.” Although originally it was used to describe pamphlets in general, it became primarily applicable to the genre of brief and defamatory attacks on pre-revolutionary French public figures. The 1762 edition of the dictionary published by the Académie française defines "libelle" as an “offensive work.” The publishers of "libelles" were known as "libellistes".
Format and style.
"Libelles" varied widely in format and style. Early "libelles" consisted of either a half-sheet or a single sheet in octavo format. Some later "libelles", published in the eighteenth century for example, were book-length, or even ran into multiple volumes. Regardless of their format, the "libelles" were cohesive in their overblown and sensationalist style; they were full of wordplay, and often employed literary techniques such as metaphor. The "libelles" were defiant of authority, and spoke out against prominent individuals.
History.
"Libelles" were invariably of a political nature, both slanderous and subversive. They proliferated during times of political crises, from the sixteenth to eighteenth centuries.
Religious conflict: the 1580s.
In the 1580s, during the French Wars of Religion, "libelles" flourished, with an average of about one "occasionnel" published per day in Paris. "Libelles" were published in support of both the Catholic and the Protestant points of view. Catholic "libelles" were typically pointed at the King, attacking his character, primarily his weak religious beliefs, and portraying him as not only godless, but evil. The Protestant "libelles" accused the Catholic League of treasonously supporting the pope.
La Fronde: 1648–1653.
During the civil war known as the Fronde, "libelles" proliferated in France, numbering around 5,000 in the years 1648–1653. During the Fronde, the majority of "libelles" were directed against Cardinal Mazarin, the chief minister of France. These "libelles" were referred to as "Mazarinades". They ridiculed Mazarin for a wide variety of things, including his low birth, his luxurious proclivities and speculated on his erotic liaison with the Queen Mother, Anne of Austria. One of the most famous of these characterized Mazarin as follows:
These "libelles" excited concerns on the part of the government. Presumably alarmed by the seditious possibilities of the "libelles", the Parlement of Paris issued an ordinance against "libellistes", declaring that anyone caught producing such pamphlets would be hanged. This ran the business of "libelles" underground, and many "libellistes" relocated to Holland—or affected to on the title pages; there they continued to publish their slander.
Pre-Revolution: 1770s–1780s.
Perhaps the most numerous and scathing "libelles" came out of the two decades prior to the French Revolution. Darnton lists five ways in which the "libelles" of the 1770s and 1780s differed from their ancestors.
First, the later "libelles" differed in their scale. Eighteenth-century "libelles" were much heftier volumes than their single (or half) sheet predecessors. Some "libelles" of this period ran as large as thirty-six volumes. The fact that such pamphlets were beginning to be compiled into books increased the longevity of the "libelles".
Second, the system which distributed the "libelles" had changed. The publishing industry which circulated eighteenth-century "libelles" was increasingly vast, and no longer localized. 
Third, the way in which the "libelles" attacked public figures had advanced. In eighteenth-century "libelles", the sex lives of the public figures who were attacked were contextualized as contemporary history.
Fourth, the way that "libelles" conceptualized their victims had changed. Even when earlier "libelles" attacked Louis XIV, a sense of respect and even deference was implied in the writings. By the 1770s, the way that the "libelles" conceptualized Louis XV was much less respectful, and implied that the monarch was a mere womanizer, with no interest in state affairs. Marie Antoinette fared even worse, as the number of pornographic libelles that involved her proliferated into the revolutionary era.
Fifth, later "libelles" seemed to criticize monarchy as a system, whereas early "libelles" only attacked individual figures. It was implied in the earlier pamphlets that individual figures, such as Mazarin, were responsible for the State's problems. With the "libelles" of the later years, however, the attack was focused against the entire governmental system, and monarchy as a whole.