Guillaume Le Vasseur de Beauplan
He created the first well described map of the Ukraine in 1639. In 1648 he made another map of the Ukraine that was very detailed. He moved to Danzig. He made two other very detailed maps and they were engraved by Willem Hondius. He wrote a book called Description d'Ukranie. It was originally named Description des contrés du Royaume de Pologne, when it was first published in 1651. It was published two more times, until 1861. It was the first book to write about the Ukraine in great detail. It's still in print today.