San Marcos and the hornazos Activity · San Lorenzo de Calatrava, Sierra Morena, Ciudad Real Image of San Lorenzo de Calatrava, not of the place itself. The celebration of San Marcos, patron saint of farmworkers in San Lorenzo de Calatrava, in the Sierra Morena region, takes place every 25 April, and it is traditional to make and eat hornazos, the typical sweets of the day. 25 de abril Photo: Rodelar (CC BY-SA 4.0) What to see and do in San Lorenzo de Calatrava