Prince was charged under section 55 of the Offences Against the Person Act 1861, which made it a misdemeanor to unlawfully take an unmarried girl under sixteen out of the possession and against the will of her father (or other lawful guardian). The evidence showed that the girl, with her own consent, left her father's custody and went with the defendant. Crucially, the girl represented that she was over sixteen, and the jury found as a fact that Prince honestly and reasonably believed she was eighteen. The trial court reserved the question whether that belief—if reasonable—negated the requisite mens rea or otherwise provided a defense. The Court for Crown Cases Reserved addressed whether the conviction could stand notwithstanding the jury's finding about the defendant's belief as to age.
Whether an honest and reasonable mistake of fact regarding the girl's being over the age of sixteen is a defense to the offense of unlawfully taking an unmarried girl under sixteen out of the possession and against the will of her father, under section 55 of the Offences Against the Person Act 1861.
When a statute criminalizes the taking of a girl under a specified age from parental or custodial control, the age element is treated as a matter of strict liability: an honest and reasonable mistake as to age is not a defense. The general presumption that crimes require a guilty mind is satisfied where the defendant intentionally engages in conduct independently wrongful (e.g., taking a young woman from her father's possession against his will), and the legislature may impose absolute responsibility for the protected-status fact (age) to effectuate child-protection purposes.
No. A mistaken but reasonable belief that the girl was over sixteen is no defense; the conviction was affirmed.
The court's majority reached the same bottom line through overlapping but distinct rationales. First, several judges interpreted section 55 as allocating the risk of mistake about age to the actor. The statute's protective purpose is to shield young girls and their custodians; allowing a mistake-of-age defense would substantially frustrate that aim. Because Parliament did not expressly require knowledge of age, the court inferred that the legislature intended strict liability for the age element. Second, some judges reasoned that mens rea existed even on the defendant's version of the facts. On this account—the moral wrong doctrine—Prince intentionally did an act wrongful in itself: he took a young, unmarried woman out of her father's possession against the father's will. That moral blameworthiness sufficed to establish a guilty mind, even if he was mistaken about a circumstance (her being under sixteen) that elevated the moral wrong to the statutory crime. The defendant, having chosen to do a wrongful act, bore the risk that the surrounding circumstances would render it criminal. A prominent dissent (Brett, J.) argued that the presumption of mens rea should control: if the facts had been as the defendant reasonably believed them to be, his conduct would not have violated section 55, so he lacked the culpable mental state as to the essential element of the crime. The dissent rejected the moral wrong rationale as too amorphous and cautioned against reading strict liability into criminal statutes absent clear legislative direction. The majority, however, concluded that either the statute imposed strict liability as to age or that the defendant's intent to do a wrongful act satisfied the mens rea requirement, leaving mistake of age immaterial.
Prince is a cornerstone of strict liability doctrine in morals and child-protection offenses. It entrenched two enduring ideas: (1) legislatures may make certain status or attendant circumstances (like a victim's age) strict-liability elements to protect vulnerable classes; and (2) where a defendant intentionally does something independently wrongful, a mistake about an aggravating circumstance will not excuse—captured by the moral wrong (and later, related legal wrong) doctrines. The case is frequently invoked in discussions of statutory rape and other age-based offenses, contrasts sharply with later cases favoring a strong mens rea presumption (e.g., Sweet v. Parsley), and provides a platform for analyzing mistake-of-fact defenses under both common-law and Model Penal Code frameworks. For students, it is a paradigmatic vehicle for exam analysis on mens rea, strict liability, mistake of fact, and legislative purpose.
Regina v. Prince crystallizes a critical boundary in criminal law: even amid the presumption favoring mens rea, legislatures may dispense with fault for certain protective-status elements, especially in offenses designed to safeguard minors and public morals. The case's dual rationales—strict liability for age and the moral wrong doctrine—equip courts to impose liability where a defendant engages in independently wrongful conduct, despite a mistake about aggravating circumstances.