Legitimacy (family law)

Lore & Background

Under English common law, a bastard could not inherit real property and could not be legitimized by the subsequent marriage of father to mother without a statute. The medieval inheritance rule of 'bastard eignè' and 'mulier puisnè' was not an exception allowing legitimation by subsequent marriage; rather, it addressed inheritance disputes where an elder illegitimate son and a younger legitimate son both claimed the same land.

Reader's Guide

Legitimacy has been a cornerstone of Western family law, determining inheritance, succession, and social standing. Over centuries, legal reforms gradually reduced the disabilities of children born out of wedlock. In the United States, a series of Supreme Court decisions in the early 1970s held most common-law disabilities invalid under the Equal Protection Clause. Many countries have legislatively abolished any legal disabilities of a child born out of wedlock. Despite decreasing legal relevance, an important exception remains in nationality laws of many countries, which do not apply jus sanguinis to children born out of wedlock, particularly when connection lies only through the father. Legitimacy also continues to be relevant to hereditary titles, with only legitimate children admitted to the line of succession.

Did You Know?

• Under English law, a bastard could not inherit real property and could not be legitimized by the subsequent marriage of his parents.
• In the United States, a series of Supreme Court decisions in the early 1970s held most common-law disabilities imposed upon illegitimacy invalid under the Equal Protection Clause.

Medieval Roots and the Architecture of Bastardy Law

This definition extended beyond simple timing, covering situations where the parents were legally unable to wed—whether one was already married to another or the relationship was incestuous. Under these English rules, a bastard was barred from inheriting real property, and even if the parents later married, the child could not be retroactively legitimized. One narrow exception existed: if an illegitimate son, termed a bastard eignè, took possession of his father's lands after the father's death, he could pass those lands to his own heirs as though his ownership had been recognized from the start, while a younger legitimate brother, a mulier puisnè, had no claim whatsoever.

The Long Legislative March Toward Equality

Across the twentieth century, English, Welsh, and Scottish legislatures progressively dismantled the legal disabilities attached to birth outside marriage.

Royalty, Inheritance, and the Social Weight of Blood

The distinction between legitimate and illegitimate offspring carried enormous social and economic weight, particularly within the aristocracy and monarchy. In Scotland, several of the kingdom's most prominent families trace their origins to the natural children of its monarchs. In the fourteenth century, Robert II granted estates in Bute to one of his illegitimate sons, founding the Stewarts of Bute, while a natural son of Robert III became the ancestor of the Shaw Stewarts of Greenock. Conversely, English law was far more rigid: a bastard could not inherit real property, and this restriction persisted regardless of the parents' subsequent marriage.

The Modern Landscape and International Commitments

The social and legal landscape surrounding children born outside marriage has shifted dramatically since the sexual revolution of the 1960s and 1970s, alongside the declining influence of Christian churches in family life. In the United States, a series of Supreme Court decisions in the early 1970s struck down most common-law disabilities imposed on illegitimate children as violations of the Fourteenth Amendment's Equal Protection Clause, though certain federal benefits—such as automatic naturalization when a father becomes a citizen—still require the child to have been legitimized in the appropriate jurisdiction. Bulgaria's constitution explicitly mandates equal rights for children born inside and outside marriage, and many other nations have legislatively removed all legal disabilities attached to out-of-wedlock birth.

Gallery