A will executed during an unregistered customary union becomes void upon the subsequent marriage of the testator under the Marriage Act, as this constitutes a 'subsequent marriage' within the meaning of section 16(1) of the Wills Act [Chapter 6:06]. An unregistered customary union does not constitute a valid marriage at law, and when parties in such a union subsequently marry under the Marriage Act, their status changes from unmarried to married persons. The exception in section 16(4) of the Wills Act applies only where the will itself shows that: (i) the testator was expecting to be married when the will was made, and (ii) the testator intended that the will should not become void upon the expected marriage. Both requirements must be satisfied. The expectation of marriage must be gathered from the will itself, not from the parties' subsequent conduct. Where a testator mistakenly believed he was already married when executing the will, and married the same person years later, this does not satisfy the requirement that the will was made in contemplation of marriage.