We know so much more about Cicero than we do about anyone else from antiquity, and because of the nature of our knowledge, especially the ‘personal’ viewpoint which his letters offer, it is easy to think we know more about him than we actually do, or to consider him unique, attributing to him alone as personality characteristics things which may in fact be features common to others of his class and time. So, for instance, he is regularly accused of inconsistency in public life by both ancients and moderns, but I believe here we are led astray by the evidence, and that he was only marginally more changeable than his contemporaries. This is a position impossible to argue, because it would require information that we do not have about the vagaries of political alliances in the 60s, 50s, and 40s bc, and about how many times various people changed their minds about different things. Even the limited material we do have, however, suggests that the successful late Republican politician held very few alliances to be unbreakable. This article explores the possibility that Cicero was particularly susceptible to the charge of inconsistency precisely because he was not one of the nobiles, and so could not lay claim to this aristocratic virtue without being challenged. It also suggests that he may in reality have had to change his mind more regularly than his contemporaries, again owing to the vulnerabilities inherent in his status. Finally, it raises the possibility that inconstantia and levitas in Latin may mean something different from what inconsistency usually means in English, at least to some speakers of the language. After brief discussion of the nuances of constantia and its opposite, I explore the charge of levitas as wielded by Cicero's enemies against him in the trials of 54 bc, his own defences against the charge, and then his use of it against others in the 50s and 40s. I should perhaps make clear that this is not an attempt to rehabilitate Cicero, except insofar as the ancient evidence misleads us into misjudging him; I hope merely to suggest that inconstantia is in the eye of the beholder, and that most of the leading figures of the Senate were more prone to see it in men like Cicero than in men like themselves.