Beatus then ventured south to the mountains above Lake Thun, taking up a hermitage in what is now known as St. Beatus Caves, near the village of Beatenberg, probably in the ninth century.
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Though his legend states that he died in the 2nd century, it is likely that his story has been conflated with other saints of the same name, especially Beatus of Vendôme, and an Abbot Beatus who received a charter in 810 from Charlemagne to confirm that Honau Abbey would be administered by Irish monks.