Dutch map of the electorate of Cologne.
Willem and Joan(nes) <a href="//commons.wikimedia.org/wiki/Blaeu" title="Blaeu">Blaeu</a>
1645
"Theatrum Orbis Terrarum, sive Atlas Novus in quo Tabulæ et Descriptiones Omnium Regionum, Editæ a Guiljel et Ioanne Blaeu"<br><a rel="nofollow" class="external text" href="https://calisphere.org/item/5414baa3-74de-452d-8247-0bd07400b95a/?order=54">University of California here</a>