The city was founded on 22 October, 1575 by Juan de Montoro as a postal service rest stop between the tal of the newly formed state of the same name when its territory was split off from the adjacent state of Zacatecas in 1835.
The city was founded on 22 October, 1575 by Juan de Montoro as a postal service rest stop between the city of Zacatecas and Mexico City. Although its founders did not envision it becoming a major city, it became the capital of the newly formed state of the same name when its territory was split off from the adjacent state of Zacatecas in 1835.