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Jon Jarl was a legendary Swedish jarl at the end of the 12th and in the early 13th centuries. He is mentioned in Eric's Chronicle from the 1320s to have spent years fighting against Russians and Ingrians in the early Swedish-Novgorodian Wars. No historical evidence on the jarl exists, even though he may be the same "Johannes Dux" who lies buried in the Linköping Cathedral.
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