Rǫgnvaldr is a name associated with several historical figures in Norse history, particularly in the context of the Viking Age. One notable Rǫgnvaldr was Rǫgnvaldr the Wise, a king of Møre og Romsdal in Norway during the 10th century. He is often remembered for his leadership and contributions to the unification of Norway. Another significant figure is Rǫgnvaldr Kali, a 12th-century earl of Orkney known for his military exploits and political alliances. He played a crucial role in the power dynamics of the Scottish and Norwegian realms during his time, influencing the history of the Orkney Islands.