No statue of Juan Nepomuceno Moreno stands today in Bogotá. Most Colombians have never heard of him, and probably only a few scholars could identify him as a Llanero patriot who fought in the battles of Boyacá and Carabobo. Yet it is not too much to say that in May 1831, the action of this obscure caudillo from Casanare might have changed the course of Colombian history. Already in Venezuela and Argentina, José Antonio Páez and Juan Manuel de Rosas had used the plains as a springboard to unseat the urban elite and take command of their nations. Now Moreno, fresh from a stunning defeat of the forces of Rafael Urdaneta at Cerinza and poised in Zipaquirá with an army of fierce Llaneros, threatened to invade Bogotá, overthrow Bolívar's successor, and impose his own dictatorship. While historians agree that the events of 1831 mark a turning point in the evolution of Colombian politics, they have yet to analyze the role played by Moreno. An examination of his career suggests that his failure to seize control stemmed not only from his own personal limitations as a leader, but was also conditioned by two important trends of nineteenth century Colombian history—the subordination of the Llanos frontier to the highlands, and the emergence of a political system dominated by civilian caudillos.