"Letters" is a formal document appointing the personal representative of the decedent’s estate. If the decedent died with a Will, the document is referred to as Letters Testamentary. If the person died without a will, the document is called Letters of Administration. Estate administration typically requires more than this one document certifying the appointment of the personal representative. Rather than the formal letters, short certificates are provided as proof that the letters were issued by the Register of Wills.