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16. Bigamy

Section 57, Tolson, and a decree that is not absolute

Posted By lanbuk.com

In simple terms

Section 57 of the Offences against the Person Act 1861 is committed by a person who, being married, goes through a legally recognised marriage with someone else while the first spouse is alive. The provisos are real. A mistaken belief that a divorce is final is not one of them.

The offence

Four things: The accused was married. The first marriage was valid and was still subsisting. It had not ended by death, by divorce, or by a decree of nullity. He or she then went through a ceremony of marriage recognised by the law of the place where it was celebrated. The first spouse was alive at that time.

The lecture's question about polygamy: The notes ask whether a customary or Muslim marriage can be the first marriage for this section, and they cite Sarwan Singh for the English view that a potentially polygamous marriage is not such a first marriage. Use that as the lecture's citation, not as a Sierra Leone decision. A statutory marriage under the Christian or civil marriage legislation is the monogamous marriage the section was written for. Do not decide a customary marriage by importing an English dictum you have not read.

The provisos

Divorce: It is a defence that the first marriage has been dissolved by a divorce. The decree must be absolute. R v Wheat and Stocks [1921] 2 KB 119 is not authority that an honest mistake will do. The accused believed, wrongly, that a decree nisi had become absolute. That belief was no defence. The lecture runs the proviso and that case together. Keep them apart.

Nullity: A decree that the first marriage was void is a defence. Inability to consummate is the lecture's example of a ground on which a court might annul. The defence is the decree, not the accused's own view that the marriage was imperfect.

Seven years: It is a defence that the first spouse has been continually absent for seven years, and that the accused did not know that spouse to be living within that time. Both parts are required. Absence alone is not enough if the accused knew the spouse was alive.

The mental element

Tolson: In R v Tolson (1889) 23 QBD 168 the accused remarried believing, on reasonable grounds, that her husband had drowned. The seven-year proviso did not decide the case. A majority held that an honest and reasonable belief that the first spouse was dead was a defence. A minority would have confined the defence to the statute. Tolson is the authority that is not, on this point, an offence of absolute liability.

Do not use Morgan to rewrite Tolson: DPP v Morgan decides that an honest belief in consent need not be reasonable where the offence requires that . The lecture then says Morgan makes Tolson's insistence on a reasonable belief unsound for bigamy. That is a textbook argument. It is not the holding in Morgan, and it is not a Sierra Leone decision that bigamy now requires only an honest belief. For this offence, state Tolson as it was decided.

Words and Latin in this note

Mens rea
The mental element in the definition of a crime. It is not one standard. Intention is the highest form. Recklessness is below it. Gross negligence sits at the bottom. The definition of the particular crime decides which is required. Open the note.
Bigamy
Going through a legally recognised marriage while a valid first marriage is still subsisting and the first spouse is alive. A real decree absolute is a defence. A mistaken belief that a decree nisi is already absolute is not.

Memory map

Bigamy

The offence

  • Four things
  • The lecture's question about polygamy

The provisos

  • Divorce
  • Nullity
  • Seven years

The mental element

  • Tolson
  • Do not use Morgan to rewrite Tolson

Key points

  • Bigamy requires a subsisting valid marriage, a…
  • A decree absolute dissolves the first marriage
  • Seven years' absence is a defence only if the…
  • Tolson allows a defence of honest and…

Cases

  • R v Tolson

Key terms

  • Bigamy
  • Mens rea

Take-home points

  • Bigamy requires a subsisting valid marriage, a second recognised ceremony, and a first spouse who is still alive.
  • A decree absolute dissolves the first marriage. Wheat and Stocks holds that a mistaken belief in a decree is not a defence.
  • Seven years' absence is a defence only if the accused did not know the spouse to be living.
  • Tolson allows a defence of honest and reasonable belief that the spouse was dead. Morgan does not overrule that.

Cases in this topic

See also

Other law notes by subject

For study only. By lanbuk.com. Always check current sources and consult a qualified professional.

Cite this page

'Bigamy, Criminal Law' (Lanbuk) <https://www.lanbuk.com/llb/criminal-law/bigamy> accessed 10 November 2026

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