<bdi><a href="//commons.wikimedia.org/wiki/Category:16th-century_portrait_paintings_of_men,_artist_and_year_missing" title="Category:16th-century portrait paintings of men, artist and year missing">Unidentified painter</a>
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scan from <i>Die Bischöfe von Konstanz</i>, <a href="//commons.wikimedia.org/wiki/Special:BookSources/3-922137-48-2" title="Special:BookSources/3-922137-48-2">ISBN 3-922137-48-2</a>