The aim of the article is to identify some of the oral sources in the Wars of Procopius of Caesarea and the way in which Procopius modified and manipulated material gained from his alleged oral informants. From the nature of the evidence it is hard to point precisely at any individual as his informant for a specific event, but it is possible to make some suggestions. It is argued that in some passages in the Wars there are circumstantial details given on various events, centered on specific person known to Procopius. The analysis of those passages shows that it would seem likely that Procopius gained many important information from Peter of Thrace (doryphoros of Solomon), Marcellus (comes excubitorum), George (confidant of Belisarius), Paulus of Cilicia (cavalry officer, former head of household of Belisarius), Sinnion (leader of the Cutrigurs) and Ortaias (Moorish ruler).