This dissertation studies the impact of the works by Giovanni Boccaccio on Catalan medieval literature. The influence of Italian literature in medieval Iberian writing is traditionally understood as a key component of a wide-ranging cultural process of transition from the Middle Ages to the Renaissance. The works of Dante, Petrarch, and Boccaccio, the tre corone, played a crucial role in that process. Boccaccio, in particular, became a model for the writing of a variety of literary genres, from misogynistic poetry to chivalric romances. His works, both in Latin and Italian, featured in the most remarkable libraries of the period as well as circulated both in Spanish and Catalan translations. Early twentieth-century criticism offered us the first comprehensive approach to Boccaccio’s influx in the Iberian Peninsula, but this line of inquiry has ever since remained neglected.