The city of León, formally León de los Aldama[2] is the fifth most populous city in Mexico and the first in the state of Guanajuato. It is also the seat of the municipality of León. It has a strong leather industry, offering shoes, boots, belts, jackets, and other leather accessories both to national and international markets.

The main church is called the Basilica Cathedral of Our Holy Mother of the Light and is the seat of the Archdiosis of Leon. Construction of the church was begun in 1746 by the Jesuits and is a combination of Baroque and Neo Classic architectural styles. Construction was halted only eight months after it began when the Jesuit order was expelled from Mexico by the Spanish Crown. The Obregon family, however, took over its constructon, continuing into the 19th century. The Archdiosis of Leon was created in 1864, with its first bishop, José María de Jesús Diez de Sollano y Dávalos helping to get the towers and cupola completed as he chose the church as the seat. It was finally completed and consecrated on 16 March 1866.