Daniël Hengst

This is the final volume in the series of commentaries on Ammianus' Res Gestae. The last book of Ammianus Marcellinus’ Res Gestae is the most important source for a momentous event in European history: the invasion of the Goths across the Danube border into the Roman Empire and the ensuing battle of Adrianople (378 CE), in which a Roman army was annihilated and the emperor Valens lost his life. Many contemporaries were of the opinion that this defeat heralded the decline of the Empire. Ammianus is sharply critical of the way Valens and his generals handled the military situation, but holds on to his belief in the permanence of Roma Aeterna, reminding his readers of earlier crises from which the Empire had recovered and pointing to the incompetence of the barbarians in siege craft.

In Book 28 Ammianus describes the military activity of Valentinian on the Rhine. The historian speaks with admiration about his efforts to strengthen the northwestern border of the empire. He shows a similar esteem for the general Theodosius, who re-established order in Britain. However, in the greater part of Book 28 there is an air of gloom. Ammianus writes reluctantly about the judicial terror inflicted on the Roman aristocracy by powerful magistrates. In his digression about Roman manners he speaks with contempt about the senatorial elite and the Roman plebs, because they fail to live up to the standards of their ancestors. The final chapter illustrates the disastrous effects of the mismanagement of the province of Tripolis by corrupt officials.

Book 27 deals with events between 365 and 370. Military operations in the western and eastern half of the Empire take up a large part of the available space. Apart from military matters Ammianus deals with internal affairs. He discusses the terms of office of four Roman urban prefects and paints a picture of Petronius Probus, the mightiest civil official of the period. The most striking part of the book contains a portrait of the emperor Valentinian. This passage forms the centre of the book, which therefore has the structure of a triptych: of the two outer parts each contains military affairs in the West and the East and reports on some notable non-military events, whilst in the central panel Valentinian takes pride of place.