Étienne d'Espagnet (born c. 1596) was the son of parliamentary counselor Jean d'Espagnet and Charlotte De Mangeau. He became a parliamentary counselor in 1617. He married in 1629 and had a son in 1634. He was friends with Viète and

Fermat Pierre de Fermat (; between 31 October and 6 December 1607 – 12 January 1665) was a French mathematician who is given credit for early developments that led to infinitesimal calculus, including his technique of adequality. In particular, he is ...

. d'Espagnet shared mathematical interest with Fermat and was the recipient of at least some of Fermat's mathematical papers.

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Date of birth unknown 1590s births French political people Year of death unknown {{Gironde-politician-stub