Courtly love was a code of conduct practiced in medieval European royal and noble courts that established a system of courtship. It was expressed through poetry and songs and involved secretive relationships between nobles in which lovers expressed their devotion and admiration for their beloved from afar. Some famous examples included the relationship between Lancelot and Guinevere in Arthurian legend. The ideals of courtly love spread through literature during this period and outlined 29 strict rules for lovers to follow regarding jealousy, fidelity, and other conventions of romantic relationships outside of marriage.