In the construction of the fi gure of Spurius Cassius coexist positive and negative aspects: the representation of the victorious commander who seeks peace and makes a deal with the Latins, the representation of the ambitious politician who was accused of aspiring to tyranny and for this reason was sentenced to death. His story is a long and tormented one, although not everyone is convinced that Spurius Cassius really existed. Keywords: Spurius Cassius, Rome, Foedus Cassianum, Adfectatio regni.