Francisco León de la Barra y Quijano was a Mexican political figure and diplomat who served as the 36th President of Mexico from May 25 to November 6, 1911 during the Mexican Revolution, following the resignations of President Porfirio Díaz and Vice President Ramón Corral. He previously served as Secretary of Foreign Affairs for one month during the Díaz administration and again from 1913 to 1914 under President Victoriano Huerta. He was known to conservatives as "The White President" or the "Pure President."

The Mexican Revolution was an extended sequence of armed regional conflicts in Mexico from 20 November 1910 to 1 December 1920. It has been called "the defining event of modern Mexican history" and resulted in the destruction of the Federal Army, its replacement by a revolutionary army, and the transformation of Mexican culture and government. The northern Constitutionalist faction prevailed on the battlefield and drafted the present-day Constitution of Mexico, which aimed to create a strong central government. Revolutionary generals held power from 1920 to 1940. The revolutionary conflict was primarily a civil war, but foreign powers, having important economic and strategic interests in Mexico, figured in the outcome of Mexico's power struggles; the U.S. involvement was particularly high. The conflict led to the deaths of around one million people, mostly noncombatants.