Ortelius was a Flemish cartographer and geographer, best known for creating the first modern atlas, titled Theatrum Orbis Terrarum, published in 1570. This work compiled maps from various sources, showcasing the world as it was known during the late 16th century. Ortelius's atlas significantly influenced the field of cartography and set a standard for future map-making. Born in 1527 in Antwerp, Ortelius was also a scholar and collector of maps. His contributions helped to popularize the use of maps for education and navigation. Ortelius's work laid the groundwork for later cartographers, including Mercator, who further advanced the art and science of map-making.