Thomas of Britain was a medieval poet known for his work in the 12th century. He is best recognized for his narrative poem, "Tristan," which tells the story of the tragic love between Tristan and Isolde. His writing is notable for its lyrical quality and its influence on later literature. Little is known about Thomas's life, but he is believed to have been of Breton origin. His contributions to the Arthurian legends and the Romance genre helped shape the storytelling traditions of his time, making him an important figure in medieval literature.