Lagrange,
Comte Joseph Louis de 1736-1813; Fr. mathematician & astronomer
See Lagrange in American Heritage Dictionary 4
(lə-grānjˈ, -gränjˈ, lä-gräɴzhˈ), Comte Joseph Louis 1736-1813.
French mathematician and astronomer. He developed the calculus of variations (1755) and made a number of other contributions to the study of mechanics.