The ancient burial sites of Knowth, Newgrange and Dowth make up the archaeological complex at Brugh na Boinne, a UNESCO world heritage site which has attracted enormous international interest. George Eogan began excavating the site at Knowth in 1962 and this is the fifth volume of the Excavations at Knowth monograph series. Volume 5 presents the findings relating to the use of the site from the Late Iron Age to the modern era. The huge array of finds excavated at Knowth associated with the period under consideration are presented, with an accompanying CD-ROM cataloguing the un-illustrated finds. A series of appendices deals with such topics as the metal content of a selection of the Roman, Viking, and Early Christian artefacts from Knowth, and the findings of a geophysical survey conducted on one area of the site in late 2011.