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How did primogeniture affect inheritance under English common law?

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King Henry II and St. Thomas Becket — Common law Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

Under English common law, primogeniture functioned as a system of undivided inheritance for real property, mandating that land pass in its entirety to the eldest son rather than being partitioned among multiple heirs.123

This practice was deeply rooted in the needs of feudalism, where land ownership was tied to specific military duties or public offices that could not be effectively divided. By keeping estates intact, primogeniture helped preserve the wealth, power, and social standing of the aristocracy and ensured that feudal services remained manageable. While originally intended for knight-service tenures, the practice was inappropriately extended to all land under common law.231

This system applied exclusively to real property; personal property was governed by different rules, often overseen by ecclesiastical courts, which favored more equitable distribution. Primogeniture as the rule of intestacy in England was eventually abolished by the Administration of Estates Act in 1925.2