Answer:
"Yvain ou le chevalier au lion" is a medieval romance written by the French poet Chrétien de Troyes. It was written in the late 12th century and consists of four chapters or "books".
The story follows the adventures of the knight Yvain, who is driven mad with love for Laudine, a lady he meets while on a quest. After marrying Laudine, Yvain forgets his chivalric duties and his reputation as a great knight begins to suffer. In order to regain his honor, he sets out on a new quest with his faithful lion companion.
Throughout his adventures, Yvain faces various challenges and battles, including a duel with his own cousin and a fight against an evil giant. He eventually proves his worth as a knight and regains his honor, while also learning the importance of balance between love and duty.
The novel is a classic example of medieval romance literature, featuring themes of chivalry, courtly love, and adventure. It is widely regarded as one of the most important works of French literature from the Middle Ages.