Page from Vienna cod. 521 of Adam von Bremen's <i>Gesta Hammaburgensis ecclesiae pontificum</i>. 
The page includes the beginning of the geographical portion <i>descriptio insularum aquilonis</i>, beginning <i>Provincia danorum tota fere in insulas dispartita est...</i>
Adam von Bremen
<bdi><a href="https://en.wikipedia.org/wiki/en:Austrian_National_Library" class="extiw" title="w:en:Austrian National Library"><span title="largest library in Austria">Austrian National Library</span></a>
</bdi>