St. Magnus of Orkney was a Norse earl and a Christian martyr, known for his piety and leadership in the Orkney Islands during the 11th century. He was the grandson of Rognvald, the first earl of Orkney, and is often celebrated for his peaceful nature and dedication to his people. His life and legacy are closely tied to the spread of Christianity in the region. Magnus was killed in 1117, reportedly due to a power struggle with his cousin Håkon, which led to his martyrdom. He was later canonized, and his feast day is celebrated on April 16. The Cathedral of St. Magnus in Kirkwall is named in his honor and serves as a significant historical site.