"Jacob Roelofs van Deventer (c. 1500/1505 in Kampen – 1575 in Cologne) was a Netherlandish cartographer of the Renaissance. He is today best known for his ...
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work in systematically cartographing all towns and cities of the Habsburg Netherlands of his time. Van Deventer was among the first to make systematic use of triangulation, a technique whose theory was described by Gemma Frisius, one of his teachers at the University of Leuven." - (en.wikipedia.org 28.09.2021)
