Final answer:
The subject of the question is the romance of chivalry in literature, particularly the works of Chrétien de Troyes.
Step-by-step explanation:
The subject of the question is the romance of chivalry in literature.
Chivalry is a code of conduct followed by knights, and it is often explored in stories and poems. One of the key creators of the romance of chivalry was Chrétien de Troyes, who used knightly adventures to delve into psychological and ethical dilemmas. His works were written in the vernacular language and were popularized by troubadours.