The identity of the author of Lazarillo has been a puzzle for nearly four hundred years. Given the subversive nature of Lazarillo and its open criticism of the Catholic Church, it is likely that the author chose to remain anonymous out of fear of religious persecution.
Neither the author nor the date and place of the first appearance of the work is known. It appeared anonymously; and no author's name was accredited to it until 1605, when the Hieronymite monk José de Sigüenza named as its author Fray Juan de Ortega. Two years later, it was accredited by the Belgian Valère André to Diego Hurtado de Mendoza. In 1608, André Schott repeated this assertion, although less categorically. The earliest known editions are the four of Alcalá de Henares, Antwerp, Medina del Campo, and Burgos, all of which appeared in 1554. Two continuations (or second parts) appeared – one, anonymously, in 1555, and the other, accredited to H. Luna, in 1620.
There has been some suggestion that the author was originally of Jewish extraction, but in 1492 had had to convert to Catholicism to avoid being expelled from Spain; that might explain the animosity towards the Catholic Church displayed in the book. Apart from the chronological difficulties this hypothesis presents, Catholic criticism of Catholic clergy, including the Pope, had had a long and even reputable tradition that can be seen in the works of famous Catholic writers such as Chaucer, Dante or Erasmus.
Documents brought to light by the Spanish palaeographer Mercedes Agulló in 2010 support the hypothesis that the author was, in fact, Diego Hurtado de Mendoza.[3] In 2023, researchers Mariano Calvo and José María Martínez have proposed and documented that the most likely author of "El Lazarillo" might be Juan de Valdés. They found their hypothesis on biographical, historical and linguistic recurrences between "El Lazarillo" and Valdes' works,[4] and specially, Valdés' Diálogo de la lengua.[5]
