Res Gestae

But if now, with your kind indulgence be it said, there has been any change (as you think), it is the soldiers, exhausting themselves without profit in many cruel wars, who have in rebellious fashion carried out a resolve of long standing, being impatient of a leader of the second rank, since they thought that no recompense for their unremitting toil and repeated victories could be made by a Caesar.

To their anger at neither winning increase in rank nor receiving the annual pay was added the unlooked-for order, that men accustomed to cold regions should go to the remotest parts of the eastern world and be dragged away destitute and stripped of everything, separated from their wives and children. Angered by this beyond their wonted manner, they gathered together at night and beset the palace, shouting loudly again and again Julianus Augustus.