Thomas Dangerfield was an English conspirator, who became one of the principal informers in the Popish Plot. His violent death at the hands of the barrister Robert Francis was clearly a homicide, although whether the killing was murder or manslaughter was a matter of considerable public debate at the time.

The Popish Plot was a fictitious conspiracy invented by Titus Oates that between 1678 and 1681 gripped the kingdoms of England and Scotland in anti-Catholic hysteria. Oates alleged that there was an extensive Catholic conspiracy to assassinate Charles II, accusations that led to the executions of at least 22 men and precipitated the Exclusion Bill Crisis. During this tumultuous period, Oates weaved an intricate web of accusations, fueling public fears and paranoia. However, as time went on, the lack of substantial evidence and inconsistencies in Oates's testimony began to unravel the plot. Eventually, Oates himself was arrested and convicted for perjury, exposing the fabricated nature of the conspiracy.