Abraham Ortelius was a Flemish cartographer and geographer, born in 1527 in Antwerp, which is now part of Belgium. He is 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 Renaissance. Ortelius's contributions to cartography included the introduction of the concept of continental drift, suggesting that the continents were once joined. His maps were notable for their accuracy and artistic quality, influencing future mapmakers and helping to advance the field of geography during the Age of Exploration.