Nikolai Lobachevsky
20 November 1792 — 12 February 1856
Nikolai Ivanovich Lobachevsky was a Russian mathematician and geometer, known primarily for his work on hyperbolic geometry, otherwise known as Lobachevskian geometry, and also for his fundamental study on Dirichlet integrals, known as the Lobachevsky integral formula.
A memorial on Digital Cemetery, an endless map you can explore. This grave stands at coordinates -14, -3.