Researchers in Sweden have opened the casket of King Erik IX, and hope to analyze his bones to understand more about the health of the twelfth-century ruler and to even make sure these remains are his.

King Erik IX ruled Sweden from 1155 to 1160 and was murdered, allegedly by an assassin working for a rival noble family or for a Danish claimant to his throne. Within a few years his remains were being revered as holy relics, and Uppsala Cathedral was built on the site where he was killed.

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