How did courtly love shape the stories told in medieval romances?

Courtly love, or fin’amor, fundamentally reshaped medieval romance by establishing a highly conventionalized code of behavior that elevated the lady to a position of near-divine authority over her lover.12

In these narratives, the lover’s pursuit was defined by "amorous vassalage," where he served his lady with the same devotion a knight owed his lord. This dynamic introduced several key elements to the genre:2

• Idealized Passion: Unlike the practical, business-oriented marriages of the time, courtly love focused on an adulterous, often unattainable, and spiritually transformative passion.1
• The Suffering Lover: Drawing inspiration from Ovid, romances depicted the hero as a slave to passion, experiencing physical and emotional turmoil—such as sleeplessness and despair—as he sought to prove his worthiness through faithful service.13
• Conflict and Duty: Romances often explored the tension between a knight’s personal desires and his obligations to his king, his lady, and God. While some works celebrated the sovereignty of passion, others, particularly later prose cycles, contrasted secular courtly love with religious ideals, sometimes condemning it as a distraction from spiritual duty.43

By the 13th century, these themes were deeply embedded in European literature, influencing everything from the Arthurian legends to allegorical works like the Roman de la rose.1