You may be thinking of Rene Descartes who created the Cartesian plane,
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Blaise Pascal (19 June 1623 - 19 August 1662).
descartes
He was the French mathematician Rene Descartes
Rene Descartes was a French philosopher and brilliant mathematician. He is considered by many to be an early leader and father of the enlightenment movement.
Pierre de Fermat