Tristan and Isolde is a tragic love story from medieval literature, originating in the 12th century. It tells the tale of Tristan, a knight, and Isolde, an Irish princess, who fall deeply in love after drinking a love potion. Their romance is complicated by Isolde's marriage to King Mark of Cornwall, Tristan's uncle, leading to a series of conflicts and heartache. The narrative explores themes of love, loyalty, and fate, often highlighting the tension between duty and desire. Various adaptations exist, including operas by Richard Wagner and numerous literary retellings, showcasing the enduring appeal of this poignant tale.