 Overall, approximately one quarter of the army consisted of cavalry troops but their importance is uncertain.Older works such as the Eleventh Edition of the "Encyclopædia Britannica" (1911) state that the Roman military of the late Empire was "marked by that predominance of the horseman which characterised the earlier centuries of the Middle Ages," but many more recent authors believe that the infantry remained predominant.There is some dispute about whether this new military structure was put into place under the Emperor Diocletian or Constantine since both reorganised the Roman Army in the late 3rd and early 4th centuries to some degree.