Flemish cartogapher Abraham Ortelius was born #OTD in 1527.
He is best known for his work in creating the first modern atlas, titled "Theatrum Orbis Terrarum" (1570). Before "Theatrum Orbis Terrarum," maps were typically scattered in various separate works. He collected & organized them into a single comprehensive volume, which proved to be a groundbreaking achievement in the history of cartography. His atlas included 53 maps, each depicting a different region of the world.