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What happened to a fief when a vassal died without an heir?

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In the social system of feudalism, if a vassal died without an heir, the fief would return to the lord through a process known as escheat.1

Escheat functioned as a legal mechanism in feudal land law where the property reverted to the original grantor or lord when the conditions of the feudal contract could no longer be fulfilled due to the lack of a successor. This ensured that the land, which was granted in exchange for specific services such as military or administrative duties, did not remain without a tenant capable of performing those obligations.213