In the second book of his Epitoma rei militaris Vegetius sets himself the task of describing the organization of the antiqua legio of the Roman Army, the units into which it was divided, its officers, the arms of its soldiers, and its tactical employment on the field of battle. Interspersed in this account are frequent references to changes that had been subsequently effected and were in operation in the author's lifetime. But although these annotations destroy the synthesis of the book, (...) and the transition from past to present is not always clearly indicated, the disentanglement of Vegetius' own additions from the material provided by his source or sources is not the chief difficulty that confronts the modern historian. For with few exceptions in chapters 4–14 Vegetius describes the antiqua legio in the imperfect, the legion of his own time in the present indicative, with the not infrequent addition of the word ‘nunc’ or ‘hodie.’ The great problem is to discover whether in his account of the antiqua legio the author is referring to any one period of Roman History, and, if so, whether its limits can be exactly defined. Many solutions have been attempted. Some scholars have thought that the period is earlier than Hadrian; the more generally accepted theory is that the antiqua legio can be identified with the legion as it was constituted in the reign of Diocletian. Recently two German historians have subjected the evidence to fresh consideration, and, while one of them agrees with the majority in selecting the age of Diocletian for his answer to the problem, the other believes that he can date the period to which Vegetius is referring to the late second century A.D. (shrink)