Aproximación al estudio de la formulación fraseológica en el Libro de buen amor

This work aims to advance in the knowledge of Spanish historical phraseology. Its main objective is to approach the study of phraseological formulation in the <italic>Libro de buen amor.</italic> The methodology employed is based on a variationist perspective, in which we will work with chronological information from the historical corpus and data referring to its phraseographic codification, all of which represents an unprecedented contribution to the study of this major work. The results obtained indicate that Juan Ruiz used consciously and meditatedly some of these formulas, motivated both by their marked oral character and by their textual function, aimed at highlighting the emotional component.