'Gunnlaugs saga ormstungu', or 'The Saga of Gunnlaugur Serpent-Tongue', is a masterpiece of Icelandic literature, written in the late 13th century. It follows the story of two Icelandic poets, Gunnlaugr Ormstunga and Hrafn Önundarson, who both love Helga the Fair, granddaughter of Egill Skallagrímsson. The saga is known for its strong characterization and emotional impact, and its skaldic poetry attributed to the main characters. The story includes prophetic dreams, a love triangle, banishment, and recitation of poetry in the courts of Northern kings, making it an engaging read for those interested in Old Norse literature and Icelandic history.