Rognvald Kali Kolsson was a notable figure in the Viking Age, known for his role as a nobleman and warrior in Norway. He was born around 1040 and was a descendant of the powerful Håkon dynasty. Rognvald is often remembered for his leadership and his involvement in various expeditions, including those to Iceland and Greenland. Rognvald was also a key figure in the establishment of the Earldom of Orkney, where he served as an earl. His legacy includes the promotion of Christianity in the region and the strengthening of ties between Norway and the Orkney Islands. His life reflects the complexities of Viking society and its expansion during the medieval period.