The Ammianus Marcellinus Online Project, led by Jan Willem Drijvers at the Rijksuniversiteit Groningen, is a developing resource on this central historian of Late Antiquity, whose virtues are extolled by authors both ancient and modern. It includes an introductory biography and bibliography on general works, as well as a list of editions, translations, commentaries, and concordances. The schematic representation of the structure of the Res Gestae, based partially on T.D. Barnes work in Ammianus Marcellinus and the Representation of Historical Reality (1988) is also helpful for presenting overviews in, say, graduate seminars or for assessing the scope of the extant work. Finally, there is a collection of original short essays by various contributors. This will be an important site of basic reference, and a useful complement to the ongoing “Dutch commentary” on Ammianus, in which Drijvers is involved.