Alonso Fernández de Avellaneda
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In 1614, a sequel to Cervantes' Don Quixote was published under the pseudonym Alonso Fernández de Avellaneda. The identity of Avellaneda has been the subject of many theories, but there is no consensus on who he was.
Modern readers generally agree that Avellaneda's continuation, which Cervantes damns up and down in his own Part II, is far inferior to the work of Cervantes. However, it is possible that Cervantes would never have completed his own continuation were it not for the stimulus Avellaneda provided.
For an introduction, a good article in English is Jim Iffland's “Do We Really Need to Read Avellaneda?” http://www.h-net.org/~cervantes/csa/artics01/iffland.pdf, published in the journal of the Cervantes Society of America.