Who wrote the unauthorized sequel to Don Quixote?

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Engraving of Miguel de Cervantes, shown with a mustache and beard, wearing a ruffled collar and cloak, based on works by Gregorio Ferro and Fernando Selma. — Miguel de Cervantes Miguel de Cervantes, engraving by E. Mackenzie after Gregorio Ferro and Fernando Selma; from *The Imperial Dictionary of Universal Biography* (1863).

The unauthorized sequel to Don Quixote, published in 1614, was written by an author using the pseudonym Alonso Fernández de Avellaneda.

The true identity of this individual remains unknown, though historical suggestions have included Fray Luis de Aliaga, Lope de Vega, and even Miguel de Cervantes himself. Cervantes, who was working on his own second volume at the time, was offended by the spurious work and the insults directed at him in its prologue. He subsequently addressed the existence of this fraudulent book within the narrative of his own Don Quixote, Part II, starting from chapter 59.123