Jarls were noble leaders in the Viking Age, primarily in Scandinavia. They held significant power and were often in charge of large territories, overseeing the administration and defense of their lands. Jarls were typically wealthy, owning extensive lands and resources, and they played a crucial role in Viking society by leading warriors in battle and making important decisions. In addition to their military responsibilities, jarls also participated in trade and diplomacy. They often engaged with other cultures, including the Franks and Byzantines, to establish alliances and expand their influence. The position of jarl was hereditary, often passed down through families, ensuring the continuation of their legacy.