Avellaneda is the name under which the never-identified author of a Second Volume of the ingenious gentleman Don Quixote de la Mancha signed himself, published in Tarragona in autumn 1614, when Cervantes was writing chapter LIX of Part Two. The authentic Second Part, of 1615, responds to that false Quixote in four moments.
First, in the prologue, without naming his rival: Cervantes says the reader would like him to call the rival an ass, a dolt, and an insolent fellow, but that such a thing does not even cross his mind, and that the other's sin will punish him. Second, in chapter LIX, at the inn: the gentleman hears two guests reading the false book, disapproves of three things in its author, among them getting the name of Sancho's wife wrong, and changes course: he does not set foot in Zaragoza, where the rival had placed him, and goes to Barcelona.
Third, in chapter LXXII: Don Álvaro Tarfe, a character from the rival book, declares before a magistrate that this is the true Don Quixote, and not the one printed in the second part. Fourth, in the will in chapter LXXIV: Alonso Quijano asks his executors that, if they know the author of the false book, they ask him on his behalf to forgive the occasion he unwittingly gave him to write so much nonsense.
In the middle, the false Quixote appears in Barcelona, in a print shop, where the gentleman sees the Second Part by a resident of Tordesillas being corrected, and in Altisidora's hell, where a devil says the book is so bad that if he set out to make it worse on purpose, he could not succeed. What is in dispute is ownership of the character, and Cide Hamete closes the matter: Don Quixote was born only for him.