Guillaume Postel, French linguist (d. 1581)
Guillaume Postel (25 March 1510 – 6 September 1581) was a French linguist, astronomer, Christian Kabbalist, diplomat, polyglot, professor, religious universalist, and writer.

Born in the village of Barenton in Normandy, Postel made his way to Paris to further his education. While studying at the Collège Sainte-Barbe, he became acquainted with Ignatius of Loyola and many of the men who would become the founders of the Society of Jesus, retaining a lifelong affiliation with them. He entered Rome in the novitiate of the Jesuits in March 1544, but left on December 9, 1545 before making religious vows.