Lagertha is a legendary figure from Norse mythology, often depicted as a fierce shieldmaiden and warrior. She is best known from the sagas, particularly the Saga of Ragnar Lothbrok, where she is portrayed as the wife of the legendary Viking king Ragnar Lothbrok. In popular culture, Lagertha has gained fame through the television series Vikings, where she is portrayed by actress Katheryn Winnick. The show highlights her strength, combat skills, and leadership, making her a prominent character in the narrative of Viking history and culture.