_The Last Gospel : a Biography of the Life and Ministry of Judas Iskariot, from his own Aramaic Notes,_, published in three volumes (1909). Gaythwaite, who claimed an Anglican clergyman as a "literary advisor”, is the assumed name or pseudonym of an unconfirmed author identified simply as J-B G-.
* The Testament of Manasseh (as “JBG”, 1927)