The article renders public and presents the archival documents, hitherto unpublished, regarding an ecclesiastical benefice in the town of Mozoncillo, which Andrés Laguna obtained in 1548. Through the said benefice, obtained, very likely, through the intervention of an important Spanish prelate, Laguna strove to obtain influence and legitimacy for himself and his family in his hometown and contribute to the eradication of the "stain" of his family's converso origins. The documents attest to an important and decisive moment in Laguna's life and career