The Introduction begins by outlining the generative tension of the early modern public sphere: debate and defamation, free speech and false news, went hand in hand. Libels were often vicious and violent. Yet they were also essential to England’s emerging media ecosystem. Drawing from public sphere theory, the first main section conceptualizes the viral circulation of libels across speech, manuscript, print, and performance; and it makes the case that theater – urban and provincial, amateur and professional alike – was central to their multimedia careers. The next section follows the intertwined semantic, cultural, and legal histories of libel from the 1550s to the early 1600s. In the process, it identifies a clear and enduring paradigm of libel: as anonymous, extralegal accusation. The third section returns to theater history, tracing the same logic to the core of efforts to regulate the stage. After surveying the relevant scholarship on dramatic censorship, it pins the theater’s proximity to libeling on the vexed question of audience interpretation. The Introduction finally locates the late Elizabethan scenes of libel in the context of the anxious years of the long 1590s (1588–1603).