"Facundo" is a book written by the Argentine author Domingo Faustino Sarmiento in 1845. It explores the life of Juan Facundo Quiroga, a caudillo or military leader in Argentina, and serves as a critique of the political and social conditions of the time. Sarmiento uses Quiroga's life to illustrate the conflict between civilization and barbarism in 19th-century Argentina. The book combines biography, history, and political commentary, making it a significant work in Latin American literature. Sarmiento's portrayal of Facundo reflects his views on the need for education and progress to counteract the influence of strongmen in society.