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 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 story has been adapted into various forms, including operas, films, and novels. It explores themes of love, betrayal, and fate, highlighting the tension between duty and desire. The enduring nature of their love has made Tristan and Isolde a classic tale in Western literature.