Abstract
M. Tullius Cicero is one of the most prominent figures of ancient rhetoric. His rhetorical speeches are characterized first and foremost by outspokenness and offensiveness and they do not lack in temper either. Since he also dealt with rhetorical theory, Cicero was fully aware of the fact that not only the uttered words and revealed facts hold significance in a rhetorical speech but also concealment and omissions. The latter rhetorical techniques are used mainly in his ad personam attacks. An eloquent example of this is his invective against Piso which I would like to present in more detail.