Fermat, Pierre de, a French mathematician, born near Montauban; made important discoveries in the properties of numbers, and with his friend Pascal invented a calculus of probabilities; was held in high esteem by Hallam, who ranks him next to Descartes (1601‒1665).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Fermanagh * Fernandez, Juan