Vacant succession describes a deceased person’s estate where there is no known heir or beneficiary entitled to inherit, or where all entitled parties have disclaimed or failed to claim, so no one is administering the estate. It broadly corresponds to “ownerless” estates before they pass to the state or a public authority.In Scots law, vacant succession is a recognised concept: where there is no heir, the estate ultimately falls to the Crown as ultimus haeres, administered in practice by the King’s and Lord Treasurer’s Remembrancer (KLTR).In England and Wales and Northern Ireland, the expression is less technical but used descriptively. Estates with no entitled next of kin or beneficiaries are treated as bona vacantia and dealt with by the Crown, Duchy of Lancaster or Duchy of Cornwall, subject to statutory and common law rules.In Ireland, a similar position applies: estates with no heirs pass as bona vacantia to the State.Practically, vacant succession issues arise in probate and intestacy, genealogical research, missing beneficiary cases and in advising on Crown or State claims to unclaimed estates, including procedures for late claims and ex gratia payments.