Rognvald Kali Kolsson — the future Saint Rognvald — conducted a naval campaign to seize the Orkney earldom from its incumbent Paul Hakonsson. The campaign included naval skirmishes around the Orkney islands. Rognvald's eventual success allowed him to build St Magnus Cathedral at Kirkwall as a memorial to his great-uncle Magnus Erlendsson — the great cathedral that still dominates the Orkney capital.
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