Lope de Vega and Pierre Corneille are both famous playwrights from the seventeenth-century, one from Spain and the other from France, respectively. This work looks at the differences and similarities in their dramatic theories and the applications of those theories. More specifically, it concentrates on the foundation of their dramatic theories: Aristotle’s Poetics as presented through the work of Francesco Robortello, a sixteenth-century Italian humanist. Since Aristotle was seen as the dramatic authority of the sixteenth and seventeenth century, it is not surprising that his ideas dominated the dramatic theory of the period. However, Robortello’s text was not a direct translation of Aristotle; it was a translation accompanied by commentaries and extrapolations. Therefore, by analyzing the influence of Robortello’s work in the texts of Lope and Corneille, in addition to the modifications Robortello made to the original Aristotelian ideas found in the Poetics, this thesis seeks to find a possible metamorphosis of Aristotelian theatre.