The Mexican city of León is founded by order of the viceroy Don Martín Enríquez de Almanza.

León, officially León de Los Aldama, is the most populous city and municipal seat of the municipality of León in the Mexican state of Guanajuato. In the 2020 census, INEGI reported 1,579,803 people living in the city of León and 1,721,215 in the municipality, making it the fourth-most populous city and third-most populous municipality in Mexico. The metropolitan area of León recorded a population of 2,140,094 in the 2020 state census, making it the seventh most populous metropolitan area in Mexico. León is part of the macroregion of Bajío within the Central Mexican Plateau.

Martín Enríquez de Almanza y Ulloa, was the fourth viceroy of New Spain, who ruled in the name of Philip II from November 5, 1568 until October 3, 1580.