Benjamin Donn (1729 - 1798), sometimes known as Benjamin Donne, was a British cartographer, surveyor, and mathematician active in England during the middle to late 18th century. Born in Bidford, England, Benjamin Donn was the heir to long line of well-respected mathematicians, including his father and older brother, who ran a local school. Early on he developed an interest in surveying and astronomy and from 1749 to 1756 was a regular contributor to the "Gentleman's Diary" where he published accounts of his astronomical observations. In 1768 he was elected librarian of the Bristol Library, and, "in keeping with his taste for the binomial theorem and the book of Euclid, he conceived the idea of converting the establishment into a mathematical academy; but the corporation did not join in his enthusiasm, and students were not invited." Later he established his own private mathematical academy in Bristol near St. Michael's Church. Cartographically, Donn's most significant work is his 1765 large format map of Devonshire, based upon a mile for mile survey he completed at his own expense. This was the first large scale map of any British county and won Donn lasting fame as well as a £100 gratuity from the Royal Society for the Arts. Donn later went on to publish a number of other less significant but popular maps including a pocket map of Bristol, a map of western England, and several nautical charts of the Western Ocean, as well as various mathematical tables. A lifetime of study and dedication to mathematics earned Donne the title of Master of Mechanics to the King, an honorarium he would hold for only a short time. Donn died in 1798. More by this mapmaker...

Thomas Jefferys (1695 - November 20, 1771) was one of the most prominent and prolific map publishers and engravers of his day. Jefferys was born in Birmingham and was apprenticed to the engraver Emmanuel Bowen in 1735. Later, in the 1740s he engraved several maps for the popular periodical Gentleman's Magazine. Around 1740 Jefferys was finally able to go into business for himself and in 1746 received an appointment as 'Geographer to Fredrick, Prince of Wales,' which shortly after translated to the position of 'Royal Cartographer to King George III.' Jefferys initially specialized in compiling and re-engraving the works of earlier cartographers into more coherent cartographic wholes. Later, while not salaried position, Jefferys' appointment as 'Royal Cartographer' guaranteed preferential access to the most up to date cartographic material available, allowing him to produce new and updated charts of exceptional accuracy. He his best known for his maps of the Americas, particularly the posthumously published 1775 American Atlas, which included some of the finest and most important late colonial era maps of America ever made. Despite his prolific publishing history, royal appointments, and international publishing fame, Jefferys lived most of his life in dire economic straits. He was bailed out of bankruptcy by Robert Sayer during the production of the American Atlas. In the end, Jefferys died suddenly with very little to his name. Nonetheless, his cartographic legacy survived, and even after his death in 1771, many of his important maps continued to be published and republished by Sayer and Bennet, Conrad Lotter, Georges Louis Le Rouge, Laurie and Whittle, and others. Many attribute some of Jefferys best maps to the colorful and criminally inclined Irish cartographic genius Braddock Mead (John Green, c. 1688 - 1757), who is considered the 'secret behind Jefferys.' Jefferys was succeeded by his son, also Thomas, who had little success as a cartographer and eventually partnered with, then sold his stock and plates to William Faden - Jefferys' true heir. Learn More...