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The Casserres article mentions "The town is first mentioned in 798, when Wilfred the Hairy established a castle here" (also, some other language pages mention the same). However, when I consult the Wikipedia pages about Wilfred the Hairy, it becomes clear that he could not have established a castle here or anywhere in 798 as he lived a century or so later. Is there any source that mentions the correct year of the Casserres castle ?