Willem Janszoon Blaeu (Dutch pronunciation: [ˈʋɪləm ˈjɑnsoːm ˈblʌu]; 1571 – 21 October 1638), also abbreviated to Willem Jansz. Blaeu, was a Dutch cartographer, atlas maker, and publisher. Along with his son Johannes Blaeu, Willem is considered one of the notable figures of the Netherlandish or Dutch school of cartography during its golden age in the 16th and 17th centuries. Source: Wikipedia (en)