The main source of this interpretation has been the works Synesius of Cyrene, specifically "Aegyptus sive de providentia" and "De regno". Both works have traditionally been interpreted to support the thesis that there were anti-barbarian and pro-barbarian groups, with the Praetorian Prefect Aurelianus being the leader of the anti-barbarian faction. Recent scholarly research has revised this interpretation, and has instead favoured the interaction of personal ambition and enmities among the principal participants as being the leading cause for the court intrigue throughout Arcadius's reign. The gradual decline of the use of Gothic mercenaries in the eastern empire's armies that began in the reign of Arcadius was driven by recruitment issues, as the regions beyond the Danube were made inaccessible by the Huns, forcing the empire to seek recruitment in Asia Minor. The current consensus can be summarised by the historian Thomas S. Burns: "Despite much civilian distrust and outright hatred of the army and the barbarians in it, there were no anti-barbarian or pro-barbarian parties at the court."