A fact from Prince Johann Ernst of Saxe-Weimar appeared on Wikipedia's Main Page in the Did you know column on 10 October 2009 (check views). The text of the entry was as follows:
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Yes, I was too quick to move this to Johann Ernst IV - this is what the de-Wiki article claims, but the only basis for this I can find is the article by Ersch, and although that numbers him as "Johannes Ernst 11", or the 4th, it doesn't actually claim that he was Duke. ADB has nothing about it, so I've reverted the article title, and added the stuff about the dukedom as a footnote instead.HeartofaDog (talk) 17:33, 3 October 2009 (UTC)[reply]