Escheat

Escheat /ᵻsˈtʃiːt/ is a common law doctrine which transfers the property of a person who dies without heirs to the crown or state. It serves to ensure that property is not left in "limbo" without recognized ownership. It originally applied to a number of situations where a legal interest in land was destroyed by operation of law, so that the ownership of the land reverted to the immediately superior feudal lord.