Don Fermín de Pas is a fictional character from the novel "Los de Abajo" by the Mexican author Mariano Azuela. He represents the wealthy landowners during the Mexican Revolution, showcasing the struggles between social classes. His character embodies the traditional values and privileges of the elite, often clashing with the revolutionary ideals of equality and justice. In the story, Don Fermín's life is marked by the upheaval caused by the revolution, which threatens his way of life. His interactions with other characters highlight the tensions and conflicts that arise during this tumultuous period in Mexican history. Through him, Azuela critiques the social injustices of the time.