I have just become aware of the 19th century French mathematician E. Midy, who apparently was the first to prove what is now known as Midy's theorem.
I can find out nothing about this mathematician beyond the fact that he wrote a paper De Quelques Propriétés des Nombres et des Fractions Décimales Périodiques from which "Midy's theorem" seems to have come.
Does anyone have any access to more information about him? Full name, dates and places of birth and death help to put him into context, but any other relevant details more than welcome.