Abuse of power by consuls was prevented with each consul given the power to veto his colleague. Therefore, except in the provinces as commanders-in-chief where each consul's power was supreme, the consuls could only act not against each other's determined will. Against the sentence of one consul, an appeal could be brought before his colleague, which, if successful, would see the sentence overturned. In order to avoid unnecessary conflicts, only one consul would actually perform the office's duties every month and could act without direct interference. In the next month, the consuls would switch roles with one another. This would continue until the end of the consular term.