May June PORTFOLIO Semester 1 2026
Unique number:
Due date: 21 May 2026
QUESTION 1
1.1 Incidental question in the Mubanga matter
The court was faced with an incidental question properly so-called, also known as a true
incidental question. An incidental question arises where a court must first decide a
subsidiary issue before it can decide the main issue.1 In this matter, the main issue was
whether the South African High Court could grant a divorce between Mr and Mrs Lynn
Mubanga. However, before granting a divorce, the court first had to determine whether their
Mauritian marriage was valid. That, in turn, depended on whether Mr Mubanga‟s earlier
Cayman Islands divorce from Bertha was valid.1
The question is “properly so-called” because the main question is governed by a foreign lex
causae. Under South African private international law, the validity of a marriage is generally
governed by the law of the place where the marriage was celebrated, the lex loci
celebrationis.1 Since the Mubangas married in Mauritius, the validity of their marriage points
to Mauritian law. The Cayman Islands divorce is therefore a preliminary question arising
,QUESTION 1
1.1 Incidental question in the Mubanga matter
The court was faced with an incidental question properly so-called, also known as a
true incidental question. An incidental question arises where a court must first decide
a subsidiary issue before it can decide the main issue.1 In this matter, the main issue
was whether the South African High Court could grant a divorce between Mr and Mrs
Lynn Mubanga. However, before granting a divorce, the court first had to determine
whether their Mauritian marriage was valid. That, in turn, depended on whether Mr
Mubanga‟s earlier Cayman Islands divorce from Bertha was valid.2
The question is “properly so-called” because the main question is governed by a
foreign lex causae. Under South African private international law, the validity of a
marriage is generally governed by the law of the place where the marriage was
celebrated, the lex loci celebrationis.3 Since the Mubangas married in Mauritius, the
validity of their marriage points to Mauritian law. The Cayman Islands divorce is
therefore a preliminary question arising within a main question governed by foreign
law.4
This is similar to Phelan v Phelan, where the main question concerned the validity of
a marriage concluded in Australia, while the incidental question concerned whether a
previous Dominican Republic divorce should be recognised.5 Neels explains that
where the incidental question concerns recognition of a foreign divorce order, the
court may have to choose between the recognition rules of the forum and those of
the lex causae.6 In the Mubanga facts, the court would therefore have to consider
whether the Cayman Islands divorce should be recognised either according to South
African private international law or according to the private international law rules of
Mauritius.7
1
M M Wethmar-Lemmer Private International Law: Only Study Guide for LJU4804 (Unisa 2020) 36.
2
Phelan v Phelan 2007 (1) SA 483 (C) 486–487.
3
Wethmar-Lemmer (n 1) 68.
4
Wethmar-Lemmer (n 1) 37.
5
Phelan v Phelan 2007 (1) SA 483 (C) 486–488.
6
J L Neels „External public policy, the incidental question properly so-called and the recognition of
foreign divorce orders‟ 2010 TSAR 671, 681.
7
Neels (n 6) 681–682.
, The court should not approach the issue mechanically.8 Following Forsyth‟s
approach, it should identify the incidental question, consider the potentially
applicable legal systems, and choose the most appropriate solution in the
circumstances.9 This avoids unfairness and promotes international harmony in
family-law matters involving foreign elements.10
1.2
The formal validity of Mr John and Mrs Lynn Mubanga‟s marriage is governed by the
lex loci celebrationis, meaning the law of the place where the marriage was
celebrated. Since the marriage was concluded in Mauritius, Mauritian law determines
whether the formalities of the marriage were validly complied with.11
QUESTION 1.3
The proprietary consequences of the Mubanga marriage are governed by the lex
domicilii matrimonii, meaning the law of the matrimonial domicile. In South African
private international law, this is still interpreted as the domicile of the husband at the
time of conclusion of the marriage.12 At the time of the marriage in December 1982,
Mr Mubanga was domiciled in England. Therefore, English law governs the
proprietary consequences of the marriage, including whether the marriage is in or
out of community of property and the division of the estate on divorce.13 Their later
domicile in South Africa does not alter this, because South African law applies the
doctrine of immutability.14
QUESTION 1.4
Divorce matters are governed by the lex fori, namely the law of the forum court.
Since Mrs Lynn Mubanga instituted divorce proceedings in a South African High
Court, South African law applies to the divorce itself, including the grounds of divorce
8
Wethmar-Lemmer (n 1) 39.
9
C F Forsyth Private International Law (5th edn, Juta 2012) 105.
10
Neels (n 6) 684–685.
11
M M Wethmar-Lemmer, LJU4804 Private International Law Study Guide (University of South Africa
2020) 68; Ngqobela v Sihele (1893) 10 SC 356; Seedat’s Executors v The Master (Natal) 1917 AD
302; Ochberg v Ochberg’s Estate 1941 CPD 15.
12
Wethmar-Lemmer (n 1) 71
13
Wethmar-Lemmer (n 1) 71.
14
Wethmar-Lemmer (n 1) 72; Brown v Brown 1921 AD 478, 482.