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Thomas Jefferys was a British mapmaker based in London. He was the geographer to Frederick Prince of Wales and from 1760 to King George III. He is most known today for his maps of North America and for his important place in the map trade. His map titled The Western Coast of Louisiana and The Coast of New Leon, was published in 1775, and is the only 18th century map to focus on the Texas coast.
Author and map collector Henry Taliaferro notes ironically, "This map is remarkable both for its large scale and for the poor state of its geography. No previous printed map had focused so closely on the Texas coast, which makes the depiction's jumbled nature even more striking. Jefferys was the world's leading, most respected cartographer in 1775, and his ignorance of the coast's geography is testimony to the obscurity of eighteenth-century Texas."
It was also known that Jefferys relied heavily on sketches and other maps captured by the British from Spanish warships. The Quintana area is approximately located by the river mouth titled Rio Barroso. Just west is the Bay of St. Louis (present-day Matagorda Bay) near where La Salle's colony was located (now Inez, Texas). Further west and south is the Rio Grande River, known at the time by three different names: Rio Del Norte, RioBravo and Wild River.