The mathematician <a href="https://en.wikipedia.org/wiki/Ubbo_Emmius" class="extiw" title="en:Ubbo Emmius">Ubbo Emmius</a> (1547-1625) published an accurate map of Ost-Friesland in 1595. His map was copied many times over during the 17th century. This map was published in 1630 by <a href="https://en.wikipedia.org/wiki/Willem_Blaeu" class="extiw" title="en:Willem Blaeu">Willem Jansz. Blaeu</a> (1571-1638). He used a copper plate that he had bought in 1629 from the inheritance of his competitor Jodocus Hondius II.
<bdi><a href="https://en.wikipedia.org/wiki/en:Willem_Blaeu" class="extiw" title="w:en:Willem Blaeu"><span title="Dutch cartographer, atlas maker and publisher (1571–1638)">Willem Blaeu</span></a>
</bdi>
1630<div style="display: none;">date QS:P571,+1630-00-00T00:00:00Z/9</div>
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