Wikipedia
The Herrerian was developed in Spain during the last third of the 16th century under the reign of Philip II (1556-1598), and continued in force in the 17th century, but transformed by the Baroque current of the time. It corresponds to the third and final stage of the Spanish Renaissance architecture, which evolved into a progressive purification ornamental, from the initial plateresque to classical purism of the second third of the 16th century and total nudity decorative that introduced the Herrerian style.
It originated with the construction of the Monastery of El Escorial ( San Lorenzo de El Escorial, Community of Madrid) and, more specifically, with the reorganization of the project made by Cantabrian architect Juan de Herrera (1530-1597), after the death of Juan Bautista de Toledo (1515-1567), author of the first design.
Its main representatives are the mentioned Herrera, who the style owes its name, and Francisco de Mora (1553-1610), disciple of the anterior and architect of the Ducal Palace of Lerma ( Lerma, Province of Burgos), other key works of Herrerian architecture.