The research on "The Eastern Part of the Mons Oppius in Rome" presented here has been conducted since March 1981 in close cooperation with the Musei Capitolini, the Sovraintendenza ai Beni Culturali of the Comune di Roma, now Roma Capitale, and other partners. It deals with the part of the Esquiline which in antiquity was occupied by a number of sanctuaries and the adjacent Horti of Maecenas. Since her first publications 20 years ago, the author has studied the archaeological finds from this area in depth, but in order to understand their historical contexts it became necessary to consider the topography of a much wider area. The results therefore include contributions to the 'Esquiline Venus', to the bust of Commodus as Hercules Romanus and the dating of the 'Esquiline Group', as well as a reconstruction of the Servian city wall between the 'Auditorium of Maecenas' and the Porta Capena. The accompanying maps, drawn by the author, are based on photogrammetric data of Roma Capitale which were generously provided by the Sovraintendente ai Beni Culturali of Roma Capitale.