The present Catalogue describes in two volumes (paged continuously) the coinage of the later Roman or Byzantine Empire from the accession of Anastaeius I in a. d. 491 to the Fall of Constantinople in 1463. With the exception of some of the specimens arranged under the headings of 'Italian' and 'Provincial' coinages, the coins here catalogued are those that are believed to have been issued by Imperial authority at Constantinople and the other mint-places of the Empire. The coinages of the so-called 'Empires' of Nicaea, Thessalonica and Trebizond, as well as those of the Vandals, Goths, and Lombards, which have often been confused with the true Imperial coinages, are reserved for treatment in a subsequent volume.