Thomas v The King

The case of *Thomas v The King* involved a charge of bigamy against the appellant, John Henry Thomas. The prosecution alleged that Thomas, while still married to his first wife, Agnes Julia Higgins, went through a form of marriage with Bessie Deed. The central dispute revolved around Thomas's belief regarding the validity of his first marriage. Evidence was presented that Thomas had been informed by his first wife that her divorce from her previous husband had not been made absolute, rendering their marriage invalid. The trial judge, despite admitting evidence of this belief, directed the jury that it did not constitute a defence. The jury returned a guilty verdict but answered a specific question affirmatively, finding that Thomas had honestly and reasonably believed his former marriage was invalid. The case was then stated for the opinion of the Court of Criminal Appeal of Victoria.

The legal issues before the High Court of Australia were whether an honest and reasonable belief by an accused that their previous marriage was invalid, due to a mistaken understanding of divorce proceedings, constituted a valid defence to a charge of bigamy. Specifically, the Court had to determine if such a belief negated the necessary *mens rea* (guilty mind) for the offence. A further issue concerned the scope of the Court of Criminal Appeal's powers when dealing with a case stated, particularly whether it could consider evidence not formally included in the stated case.

The High Court, in a majority decision, held that an honest and reasonable belief by the accused that his former marriage was invalid, even if mistaken, did constitute a defence to bigamy. The Court reasoned that the offence of bigamy requires the accused to be a married person at the time of the second marriage. If the accused genuinely and reasonably believed their prior marriage was invalid (in this case, because the divorce decree nisi had not been made absolute), then they did not possess the requisite *mens rea* for the crime. The Court distinguished this from a mistake of law, emphasizing that the belief here was about a factual matter – whether a court decree had been finalised. The majority applied the principle established in *R. v. Tolson* (1889) 23 Q.B.D. 168, which held that an honest and reasonable belief in facts that would render the act innocent is a defence, and departed from the approach taken in *R. v. Wheat and Stocks* (1921) 2 K.B. 119. The Court also found that the Court of Criminal Appeal had erred by considering evidence outside the case stated when answering the second question.

The High Court varied the decision of the Court of Criminal Appeal. It held that the jury's finding that the accused held an honest and reasonable belief that his former marriage was invalid meant he was not guilty of the offence charged. Consequently, the conviction was quashed.