The first book proclaiming Marlowe to be the author of the Shakespeare works, published in 1895.
Wilbur Gleason Zeigler was born in Fremont, Ohio on September 29, 1857. He was a direct lineal descendant of Thomas Fitch, Colonial Governor of Connecticut from 1754 to 1766. Zeigler was a Member of the Bars of Ohio, California, New York and the Supreme Court of the United States. He was the first writer to advance the theory that the Shakespeare Plays were written by Christopher Marlowe, of which William J. Rolfe said in his review of It was Marlowe in the “New York Critic” of November 1898, “The Baconian heretics might be forgiven if they had put their mad hypothesis in the same readable form.”
It Was Marlowe: The Secret of Three Centuries has long been out of print. While most of those who believe Marlowe was Shakespeare have the evidence in the Coroner's Inquest Report that suggests his death was faked by his patron Thomas Walsingham* to go by, Zeigler did not, which makes his conviction that much more astounding. The Coroner's Report on Christopher Marlowe's "death" wasn't discovered until 1925 by Leslie Hotson, a good thirty years after Zeigler wrote his book in 1895.
*Likely with the aid of Lord Burghley and Essex, whose companion Southampton was always nearby.