The Marlovian theory

The Marlovian theory of Shakespeare authorship holds, first, that Christopher Marlowe did not die on 30th May 1593 as the historical records show, his death having been faked; and second, that in fact he survived long enough to be the main author of the poems and plays typically attributed to William Shakespeare. These are the two things upon which all of those who subscribe to the theory ("Marlovians") would agree.

Against the suggestion that his death was faked are both the fact that it was accepted as genuine by no fewer than sixteen jurors at a coroner's inquest and that there is a complete lack of direct evidence supporting his survival beyond 1593. As for his writing Shakespeare's works, it is generally believed that Marlowe's style—and indeed his whole world-view—are too different to Shakespeare's for this to have been possible, and that all the direct evidence in any case points to William Shakespeare as being the true author. This means that the Marlovian theory is dismissed as nonsense by almost all professional Shakespearian scholars.

Source: Wikipedia