Giovanni Antonio Magini (June 13, 1555 - February 11, 1617) was an Italian astronomer, astrologer, cartographer, and mathematician. Born in Padua, he completed his studies in philosophy in Bologna in 1579. In 1588 he was chosen over Galileo Galilei as the chair of mathematics at the University of Bologna after the death of Egnatio Danti. Magini was a prolific writer, putting forth theories of celestial motion (he was a supporter of a geocentric solar system), the use of quadrants in surveying and astronomy, and trigonometry. In 1608, Magini produced the first map of Italy to improve on that of Gastaldi: his meticulously researched and beautifully engraved 8-sheet Italia Nuova was hugely influential: upon its publication, Blaeu promptly copied it to produce his own wall map of Italy; the rest of the mapmaking establishment swiftly followed suit. Consequently, virtually every 17th century map of Italy can be identified as a derivative of Magini's monumental achievement. His atlas, Atlante geografico d’Italia, was published posthumously by his son in 1620. This work was intended to include maps of every Italian region with exact nomenclature and historical notes. He also served as court astrologer for the Duke of Mantua. More by this mapmaker...

Girolamo Porro (1520 - 1604) was an Venetian engraver, humanist, illustrator, map maker, and publisher. Porro was born in Padua but lived most of his life in Venice. Porro worked with a number of important Venetian humanists including Camillo Camilli, Scipione Barbuo, Porcacchi, Ruscelli, and Ariosto. Cartographically Porro has produced only a few works, but these include such important works as the maps for Porcacchi's 1572 Isole piu Famose del Mondo (including the first obtainable specific map of North America), and the maps included with Ruscelli's 1574 Italian translation of Ptolemy's Geographia. Learn More...

Gerard Mercator (March 5, 1512 - December 2, 1594) is a seminal figure in the history of cartography. Mercator was born near Antwerp as Gerard de Cremere in Rupelmonde. He studied Latin, mathematics, and religion in Rupelmonde before his Uncle, Gisbert, a priest, arranged for him to be sent to Hertogenbosch to study under the Brothers of the Common Life. There he was taught by the celebrated Dutch humanist Georgius Macropedius (Joris van Lanckvelt; April 1487 - July 1558). It was there that he changed him name, adapting the Latin term for 'Merchant', that is 'Mercator'. He went on to study at the University of Louvain. After some time, he left Louvain to travel extensively, but returned in 1534 to study mathematics under Gemma Frisius (1508 - 1555). He produced his first world map in 1538 - notable as being the first to represent North America stretching from the Arctic to the southern polar regions. This impressive work earned him the patronage of the Emperor Charles V, for whom along with Van der Heyden and Gemma Frisius, he constructed a terrestrial globe. He then produced an important 1541 globe - the first to offer rhumb lines. Despite growing fame and imperial patronage, Mercator was accused of heresy and in 1552. His accusations were partially due to his Protestant faith, and partly due to his travels, which aroused suspicion. After being released from prison with the support of the University of Louvain, he resumed his cartographic work. It was during this period that he became a close fried to English polymath John Dee (1527 - 1609), who arrived in Louvain in 1548, and with whom Mercator maintained a lifelong correspondence. In 1552, Mercator set himself up as a cartographer in Duisburg and began work on his revised edition of Ptolemy's Geographia. He also taught mathematics in Duisburg from 1559 to 1562. In 1564, he became the Court Cosmographer to Duke Wilhelm of Cleve. During this period, he began to perfect the novel projection for which he is best remembered. The 'Mercator Projection' was first used in 1569 for a massive world map on 18 sheets. On May 5, 1590 Mercator had a stroke which left him paralyzed on his left side. He slowly recovered but suffered frustration at his inability to continue making maps. By 1592, he recovered enough that he was able to work again but by that time he was losing his vision. He had a second stroke near the end of 1593, after which he briefly lost speech. He recovered some power of speech before a third stroke marked his end. Following Mercator's death his descendants, particularly his youngest son Rumold (1541 - December 31, 1599) completed many of his maps and in 1595, published his Atlas. Nonetheless, lacking their father's drive and genius, the firm but languished under heavy competition from Abraham Ortelius. It was not until Mercator's plates were purchased and republished (Mercator / Hondius) by Henricus Hondius II (1597 - 1651) and Jan Jansson (1588 - 1664) that his position as the preeminent cartographer of the age was re-established. Learn More...