Letters of Administration equates to a Grant of Probate where the person who has died did not leave a Will. The application is made to one of the regional Probate Registries by a person whose function is similar to that of an executor, and although the terminology is sometimes mixed up, their official name is the administrator. The person who acts as administrator is the person who is entitled to the biggest portion of the deceased's estate. The Law states who inherits a person's estate when they have died intestate i.e. without leaving a Will.