1772 Vaugondy / Diderot Map of California in five states, California as an Island

Gilles (1688 - 1766) and Didier (c. 1723 - 1786) Robert de Vaugondy were map publishers, engravers, and cartographers active in Paris during the mid-18th century. The father and son team were the inheritors to the important Sanson cartographic firm whose stock supplied much of their initial material. Graduating from Sanson's maps, Gilles, and more particularly Didier, began to produce their own substantial corpus. The Vaugondys were well-respected for the detail and accuracy of their maps, for which they capitalized on the resources of 18th-century Paris to compile the most accurate and fantasy-free maps possible. The Vaugondys compiled each map based on their own geographic knowledge, scholarly research, journals of contemporary explorers and missionaries, and direct astronomical observation. Moreover, unlike many cartographers of this period, they took pains to reference their sources. Nevertheless, even in 18th-century Paris, geographical knowledge was limited - especially regarding those unexplored portions of the world, including the poles, the Pacific Northwest of America, and the interiors of Africa, Australia, and South America. In these areas, the Vaugondys, like their rivals De L'Isle and Buache, must be considered speculative or positivist geographers. Speculative geography was a genre of mapmaking that evolved in Europe, particularly Paris, in the middle to late 18th century. Cartographers in this genre would fill in unknown lands with theories based on their knowledge of cartography, personal geographical theories, and often dubious primary source material gathered by explorers. This approach, which attempted to use the known to validate the unknown, naturally engendered rivalries. Vaugondy's feuds with other cartographers, most specifically Phillipe Buache, resulted in numerous conflicting papers presented before the Academie des Sciences, of which both were members. The era of speculative cartography effectively ended with the late 18th-century explorations of Captain Cook, Jean Francois de Galaup de La Perouse, and George Vancouver. After Didier died, his maps were acquired by Jean-Baptiste Fortin, who in 1787 sold them to Charles-François Delamarche (1740 - 1817). While Delamarche prospered from the Vaugondy maps, he defrauded Vaugondy's window Marie Louise Rosalie Dangy of her rightful inheritance and may even have killed her. More by this mapmaker...

Denis Diderot (October 5, 1713 - July 31, 1784) was a French Enlightenment era philosopher, publisher and writer. Diderot was born in the city of Langres, France and educated at the Lycée Louis le Grand where, in 1732, he earned a master of arts degree in philosophy. Diderot briefly considered careers in the clergy and in law, but in the end chose the more fiscally challenge course of a writer. Though well respected in philosophical circles Diderot was unable to obtain any of the government commissions that commonly supported his set and consequently spent much of his life in deep poverty. He is best known for his role in editing and producing the Encyclopédie . The Encyclopédie was one of the most revolutionary and impressive works of its time. Initially commissioned as a translation of Ephraim Chambers' Cyclopaedia, or Universal Dictionary of Arts and Sciences, Diderot instead turned into a much larger and entirely new work of monumental depth and scope. Diderot's Encyclopédie was intended to lay bare before the common man the intellectual mysteries of science, art and philosophy. This revolutionary mission was strongly opposed by the powers of the time who considered a learned middle class it a threat to their authority. In the course of the Encyclopédie production Diderot was imprisoned twice and the work itself was officially banned. Nonetheless, publication continued in response to a demand exceeding 4000 subscribers. The Encyclopédie was finally published in 1772 in 27 volumes. Following the publication of the Encyclopédie Diderot grew in fame but not in wealth. When the time came to dower his only surviving daughter, Angelique, Diderot could find no recourse save to sell his treasured library. In a move of largess, Catherine the II Russia sent an emissary to purchased the entire library on the condition that Diderot retain it in his possession and act as her "librarian" until she required it. When Diderot died of gastro-intestinal problems 1784, his heirs promptly sent his vast library to Catherine II who had it deposited at the Russian National Library, where it resides to this day. Learn More...