Escheat is an obstruction of the course of descent and the consequent reversion of property to the original grantor. At common law there were two main ways this could happen.

• If you were convicted of a felony, in English law, your property was forfeit to the Crown upon conviction. If you were executed for the crime, your heirs were ineligible to inherit it from you. Avoiding this result is the chief import of the passage in Article 3 § 3 of the United States Constitution which states that attainders for treason do not give rise to forfeiture or "corruption of blood."
• If you have no other heir to receive your property by the laws of intestacy, however they may operate in your locality, any property you leave at death is forfeit to the government. This result can be avoided if the decedent makes a Last Will and Testament. In English law, the doctrine of escheat has been replaced by bona vacantia, by which ownerless property passed by law to the Crown.

Escheat can also occur when an entity (such as a bank) holding money or property (such as an account in that bank) has the property goes unclaimed. In many jurisdictions, if the owner cannot be located, such property can be revocably escheated to the government.

Feudalism

In terms of Feudalism in England, escheat was when the tenant of a fief died without an heir, or commited a felony. The fief reverted back to ownership of the King for one year and one day (by right of primer seisen, since all property belonged to the King in a Feudal system), after which it reverted back to the original lord who had granted it. The king took particular interest in this as a source of revenue starting with Henry III.

From the 12th century onward the crown paved the way for escheators (those who managed escheats), with one escheator per county established by the middle of the 14th century. Escheators reported to the Exchequer. Upon learning the death of a tenant the escheator would hold an "inquisition" to learn if the king had any rights to the land, and if there was any doubt the escheator would sieze the land and refer the case to Westminster where it would be settled, ensuring that not one days revenue would be lost. This would be a source of concern with land owners when there were delays from Westminster.

References

• S.T. Gibson, "The Escheatries, 1327-1341", English Historical Review, 36(1921).
• John Bean, The Decline of English Feudalism, 1215-1540, 1968.