Évariste Galois
25 October 1811 — 31 May 1832
Évariste Galois was a French mathematician and political activist. While still in his teens, he was able to determine a necessary and sufficient condition for a polynomial to be solvable by radicals, thereby solving a problem that had been open for 350 years. His work laid the foundations for Galois theory and group theory, two major branches of abstract algebra.
A memorial on Digital Cemetery, an endless map you can explore. This grave stands at coordinates 8, 13.