How did primogeniture affect inheritance of fiefs?

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In the context of feudalism, primogeniture was a crucial practice that ensured the fief—a vassal's source of income and land—remained undivided upon inheritance.12

This system was essential to the feudal order for several reasons:

  • Preservation of Duties: Fiefs were often tied to specific military duties, public offices, or administrative services that could not be effectively divided among multiple heirs.1
  • Maintaining Stability: By preventing the partition of land, primogeniture ensured that the fief remained large enough to support the vassal and fulfill the knightly service owed to the lord.31
  • Social Hierarchy: For the nobility, keeping estates intact was vital to preserving family wealth, power, and prestige.41

While primogeniture favored the eldest son, the practice was not always absolute. Under pressure from younger sons, portions of an inheritance were sometimes set aside as compensation, a practice known as appanage. Ultimately, the system served to protect the integrity of the feudal military and social structure by avoiding the fragmentation of landholdings.21