The autobiography of Juan Francisco Manzano (1797-1853) is a unique testimony on slavery, written in Spanish by a slave. Its composition in 1835 was made possible by the efforts of Domingo del Monte, who encouraged the poet to write an autobiography. Manzano had to learn to read and write before venturing to narrate the events of his life in a legible manuscript, but with many errors. To make it more accessible to readers Del Monte entrusted the manuscript to Anselmo Suárez y Romero to give it shape and make the necessary corrections. Suárez y Romero fully complied with the request, but also changed the life of the slave with the intention that the testimony would be more strongly in favor of the abolition of the slave trade and slavery. Both the original autobiography and the version edited by Suárez y Romero disappeared. The original, found a century later at the Jose Marti National Library, was published in 1937 by José Luciano Franco. The Suárez y Romero version, found in the mid-eighties in the Sterling Library of Yale University and unpublished so far, is provided to readers in this book.