Consanguinity in the context of "Taboo"

Family (from Latin: familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictability, structure, and safety as members mature and learn to participate in the community. Historically, most human societies use family as the primary purpose of attachment, nurturance, and socialization.

Anthropologists classify most family organizations as matrifocal (a mother and her children), patrifocal (a father and his children), conjugal (a married couple with children, also called the nuclear family), avuncular (a man, his sister, and her children), or extended (in addition to parents, spouse and children, may include grandparents, aunts, uncles, or cousins).

In anthropology, kinship is the web of social relationships that form an important part of the lives of all humans in all societies, although its exact meanings even within this discipline are often debated. Anthropologist Robin Fox says that the study of kinship is the study of what humans do with these basic facts of life – mating, gestation, parenthood, socialization, siblingship etc. Human society is unique, he argues, in that we are "working with the same raw material as exists in the animal world, but [we] can conceptualize and categorize it to serve social ends." These social ends include the socialization of children and the formation of basic economic, political and religious groups.

Kinship can refer both to the patterns of social relationships themselves, or it can refer to the study of the patterns of social relationships in one or more human cultures (i.e. kinship studies). Over its history, anthropology has developed a number of related concepts and terms in the study of kinship, such as descent, descent group, lineage, affinity/affine, consanguinity/cognate and fictive kinship. Further, even within these two broad usages of the term, there are different theoretical approaches.

A clan is a group of people united by actual or perceived kinshipand descent. Even if lineage details are unknown, a clan may claim other descent from a founding member or apical ancestor who serves as a symbol of the clan's unity. Many societies' exogamy rules are on a clan basis, where all members of one's own clan, or the clans of both parents or even grandparents, are excluded from marriage as incest.

Clans preceded more centralized forms of community organization and government, and have existed in every country. Members may identify with a coat of arms or other symbol.

In the lineal kinship system used in the English-speaking world, a niece or nephew is a child of an individual's sibling or sibling-in-law. A niece is female and a nephew is male, and they would call their parents' siblings aunt or uncle. The gender-neutral term nibling has been used in place of the common terms, especially in specialist literature.

As aunt/uncle and niece/nephew are separated by one generation, they are an example of a second-degree relationship. Unless related by marriage, they are 25% or more related by blood if the aunt/uncle is a full sibling of one of the parents, or 12.5% if they are a half-sibling.

Eleanor of Aquitaine (French: Aliénor d'Aquitaine or Éléonore d'Aquitaine; Occitan: Alienòr d'Aquitània [aljeˈnɔɾ dakiˈtanjɔ]; Latin: Helienordis, Alienorde or Alianor; c. 1124 – 1 April 1204) was duchess of Aquitaine from 1137 to 1204, queen of France from 1137 to 1152 as the wife of King Louis VII, and queen of England from 1154 to 1189 as the wife of King Henry II. As the reigning duchess of Aquitaine, she ruled jointly with her husbands and two of her sons, Kings Richard I and John of England. As the heiress of the House of Poitiers, which controlled much of southwestern France, she was one of the wealthiest and most powerful people in Western Europe during the High Middle Ages.

The eldest child of Duke William X of Aquitaine and Aénor de Châtellerault, Eleanor became duchess upon her father's death in 1137. Later that year, she married Louis, son of King Louis VI of France. Shortly afterwards, Eleanor's father-in-law died and her husband became king, making her queen consort. Louis VII and Eleanor had two daughters, Marie and Alix. During the Second Crusade, Eleanor accompanied Louis to the Holy Land. Pope Eugene III rejected an initial request in 1149 for an annulment of the marriage on grounds of consanguinity. In 1152, after fifteen years of marriage, Eleanor had not borne a male heir, and the annulment was granted. Their daughters were declared legitimate, custody was awarded to Louis, and Eleanor's lands were restored to her.

The Catholic Monarchs were Queen Isabella I of Castile (r. 1474–1504) and King Ferdinand II of Aragon (r. 1479–1516), whose marriage and joint rule marked the de facto unification of Spain. They were both from the House of Trastámara and were second cousins, as they were both descended from John I of Castile. To remove the obstacle that this consanguinity would otherwise have posed to their marriage under canon law, they were given a papal dispensation by Sixtus IV. They married on October 19, 1469, in the city of Valladolid; Isabella was 18 years old and Ferdinand a year younger. Most scholars generally accept that the unification of Spain can essentially be traced back to the marriage of Ferdinand and Isabella. Their reign was called by W.H. Prescott "the most glorious epoch in the annals of Spain."

Spain was formed as a dynastic union of two crowns rather than a unitary state, as Castile and Aragon remained separate kingdoms until the Nueva Planta decrees of 1707–1716. The court of Ferdinand and Isabella was constantly on the move in order to bolster local support for the crown from local feudal lords. The title of "Catholic King and Queen" was officially bestowed on Ferdinand and Isabella by Pope Alexander VI in 1494, in recognition of their defence of the Catholic faith within their realms.

Incest (/ˈɪnsɛst/ IN-sest) is sex between close relatives, for example a brother, sister, or parent. This typically includes any kind of sexual activity between people in consanguinity (blood relations), and sometimes those related by lineage. It is condemned and considered immoral in many societies. It can lead to an increased risk of genetic disorders in children in case of pregnancy from incestuous sex.

The incest taboo is one of the most widespread of all cultural taboos, both in present and in past societies. Most modern societies have laws regarding incest or social restrictions on closely consanguineous marriages. In societies where it is illegal, consensual adult incest is seen by some as a victimless crime. Some cultures extend the incest taboo to relatives with no consanguinity, such as milk-siblings, stepsiblings, and adoptive siblings, albeit sometimes with less intensity. Third-degree relatives (such as half-aunt, half-nephew, first cousin) on average have 12.5% common genetic heritage, and sexual relations between them are viewed differently in various cultures, from being discouraged to being socially acceptable. Children of incestuous relationships have been regarded as illegitimate, and are still so regarded in some societies today. In most cases, the parents did not have the option to marry to remove that status, as incestuous marriages were, and are, normally also prohibited.