This essay gives account of the unique copy of the editio princeps of this poem (Toledo, Pedro Rodríguez, 1604), unknown hitherto, and found in the Dámaso Alonso's Library at the Real Academia Española's Library. This copy presents several important changes with regard to other editions of this text, one of the most read at that time, with nearly forty editions in the xvii century. We also offer
... [Show full abstract] here some new biographical data of the author, José de Valdivieso, very well acquainted in that century, because he was aprobante of the best Literature and friend of the most known authors, as Lope de Vega or Cervantes, in order to show the Vida de San José's importance for his professional development.