Though it sounds ancient, the specific phrase "incestus ad infinitum" is a modern invention. It was coined for the 2025 British parody film, , a comedic spoof of period dramas like Downton Abbey .
: Roman civil law strictly forbade marriages between parents and children in both ascending and descending lines ad infinitum (indefinitely). Categories : Roman law divided the concept into incestus iuris gentium (universal incest) and incestus iuris civilis (incest specific to Roman citizens). incestus ad infinitum meaning
As of early 2026, the film is available through several digital platforms: Available on Max (HBO Max) in the U.S.. Though it sounds ancient, the specific phrase "incestus