Ragnar Lothbrok was a legendary Norse hero and king, often depicted as a Viking warrior and explorer. He is believed to have lived during the 9th century and is associated with various raids across England and France. His exploits are chronicled in several sagas, which blend history and myth, making it difficult to separate fact from fiction. Ragnar is often portrayed as the father of several famous sons, including Ivar the Boneless and Bjorn Ironside, who also became notable figures in Viking history. His legacy has inspired numerous adaptations in popular culture, including the television series Vikings.