Qu'est-ce qui est autorisé en matière de mariage ?
Defined through marriage

Some cultures include relatives by marriage in incest prohibitions; these relationships are called affinity rather than consanguinity. For example, the question of the legality and morality of a widower who wished to marry his deceased wife's sister was the subject of long and fierce debate in the United Kingdom in the 19th century, involving, among others, Matthew Boulton and Charles La Trobe. The marriages were entered into in Scotland and Switzerland respectively, where they were legal. In medieval Europe, Lateran IV ruled that standing as a godparent to a child also created a bond of affinity; which precluded legal marriage. But in other societies, a deceased spouse's sibling was considered the ideal person to marry. The Hebrew Bible forbids a man from marrying his brother's widow with the exception that, if his brother dies childless, the man is required to marry his brother's widow so as to "raise up seed to him". Some societies have long practiced sororal polygyny, a form of polygamy in which a man marries multiple wives who are sisters to each other (though not closely related to him).

In Islamic law, marriage among close blood relations like parents, stepparents, parents in-law, siblings, stepsiblings, the children of siblings, aunts, and uncles is forbidden, while first or second cousins may marry. Marrying the widow of a brother or the sister of a deceased or divorced wife is also allowed.
Droit

Les lois sur le mariage se réfèrent aux exigences légales qui déterminent la validité d'un mariage, lesquelles varient considérablement d'un pays à l'autre. L'article 16 de la Déclaration universelle des droits de l'homme déclare que :

1. Les hommes et les femmes, ayant atteint l'âge de consentir, sans aucune restriction fondée sur la race, la nationalité ou la religion, ont le droit de se marier et de fonder une famille. Ils ont droit à des droits égaux en cas de mariage, pendant le mariage et lors de son dissolution.

2. Le mariage ne peut être contracté qu'avec le libre et plein consentement des futurs époux.

3. La famille est la cellule naturelle et fondamentale de la société et a droit à la protection de la société et de l'État.
### Query ###
Qu'est-ce qui est autorisé en matière de mariage ?

### Main Text ###
Defined through marriage

Some cultures include relatives by marriage in incest prohibitions; these relationships are called affinity rather than consanguinity. For example, the question of the legality and morality of a widower who wished to marry his deceased wife's sister was the subject of long and fierce debate in the United Kingdom in the 19th century, involving, among others, Matthew Boulton and Charles La Trobe. The marriages were entered into in Scotland and Switzerland respectively, where they were legal. In medieval Europe, Lateran IV ruled that standing as a godparent to a child also created a bond of affinity; which precluded legal marriage. But in other societies, a deceased spouse's sibling was considered the ideal person to marry. The Hebrew Bible forbids a man from marrying his brother's widow with the exception that, if his brother dies childless, the man is required to marry his brother's widow so as to "raise up seed to him". Some societies have long practiced sororal polygyny, a form of polygamy in which a man marries multiple wives who are sisters to each other (though not closely related to him).

In Islamic law, marriage among close blood relations like parents, stepparents, parents in-law, siblings, stepsiblings, the children of siblings, aunts, and uncles is forbidden, while first or second cousins may marry. Marrying the widow of a brother or the sister of a deceased or divorced wife is also allowed.

### Supplementary Text ###
Droit

Les lois sur le mariage se réfèrent aux exigences légales qui déterminent la validité d'un mariage, lesquelles varient considérablement d'un pays à l'autre. L'article 16 de la Déclaration universelle des droits de l'homme déclare que :

1. Les hommes et les femmes, ayant atteint l'âge de consentir, sans aucune restriction fondée sur la race, la nationalité ou la religion, ont le droit de se marier et de fonder une famille. Ils ont droit à des droits égaux en cas de mariage, pendant le mariage et lors de son dissolution.

2. Le mariage ne peut être contracté qu'avec le libre et plein consentement des futurs époux.

3. La famille est la cellule naturelle et fondamentale de la société et a droit à la protection de la société et de l'État.

### Draft ###

### 1. Query Parsing

"Qu'est-ce qui est autorisé en matière de mariage ?" 
→ "What is authorized in marriage matters?"

Key semantic issue: "autorisé" = legally permitted vs. socially acceptable. User likely seeking legal framework.

French context suggests civil law jurisdiction (France/civil law countries). But "matière de mariage" = broad topic.

### 2. Domain Analysis

Marriage law intersects:
- Constitutional law (rights framework)
- Civil code provisions  
- Religious law (varies by jurisdiction)
- International treaties (human rights)
- Case law precedents

Geographic scope matters enormously. ⚠ No universal answer exists.

### 3. Knowledge State Assessment

Core principles ●:
- Age of consent requirements
- Voluntary consent doctrine
- Equal treatment regardless of background
- State recognition vs. religious ceremonies

Complex variations ◐:
- Affinity marriage restrictions
- Polygamy legality (evolving)
- Gender/sex-based marriage definitions  
- Immigration-related marriage
- Transnational marriage recognition

### 4. Information Gaps

Critical unknowns:
- Which jurisdiction exactly?
- Temporal dimension (laws change)
- Religious vs. civil marriage distinction
- Recent legal developments

∴ Cannot provide definitive answer without jurisdiction specification.

### 5. Logical Constraints

Physical/legal realities limit possibilities:
- Age restrictions (typically 16-18)
- Mental capacity requirements
- Prohibited relationships (incest laws)
- Residency/citizenship factors

But variations enormous across systems.

### 6. Response Strategy

Acknowledge complexity upfront.
Provide general framework (constitutional rights, voluntary consent).
Highlight jurisdictional variations.
Emphasize need for specific legal consultation.
Avoid definitive claims about specific countries.

NB: User deserves accurate scope of legal uncertainty rather than oversimplified answer.

### 7. Uncertainty Assessment

P(definitive answer possible) ≈ 0.05
P(general framework helpful) ≈ 0.85  
P(jurisdictional variation matters) ≈ 0.95

→ Justified uncertainty approach.

### Answer###
Le mariage est encadré par des lois qui varient selon les pays et les systèmes juridiques. Les principes fondamentaux incluent généralement que les hommes et les femmes, ayant atteint l'âge de consentir, ont le droit de se marier sans discrimination fondée sur la race, la nationalité ou la religion. Le consentement doit être libre et pleinement donné par les futurs époux.

Concernant les relations spécifiques autorisées, la question de l'affinité - c'est-à-dire les liens par alliance - peut présenter des complexités. Historiquement, certains systèmes juridiques interdisaient les mariages avec les proches parents de la personne décédée, tandis que d'autres les considéraient comme acceptables. 

Les lois sur le mariage définissent également les conditions de validité du mariage et peuvent établir des restrictions concernant les degrés de parenté autorisés. Ces règles varient considérablement d'une juridiction à l'autre.

Il est important de noter que les droits et obligations liés au mariage peuvent également différer selon le contexte légal et culturel spécifique.