Among the more famous mathematicians in history, like Descartes, or Newton, Liebnitz, or Fibonnacci, there as a fellow who is somewhat less well known named DeHorst.
Helmholt DeHorst lived in the early 1500s. Like his contemporary René Descartes, he presented many papers at the Royal Society. One of his special interests was charts and graphs, but his rival René beat him to it with his Cartesian system of coordinates.
This is why math historians always put Descartes before DeHorst.