The Shakespeare Code it is one of his own from "Henry V", which was probably written in early 1599. When questioning Shakespeare about witches, Martha remarks that he has written about witches; a reference to "Macbeth", which Shakespeare denies. At the time in which the episode is set, Shakespeare had yet to write "Macbeth" or "Hamlet", which prominently feature the paranormal, such as witches and ghosts. There are numerous other allusions to Shakespeare's plays. Just before the Doctor steps out of the TARDIS, he exclaims "Brave new world", from Act V Scene I of "The Tempest". In an early scene a sign is
History of the Shakespeare authorship question in several publications in the 21st century, including Robin Williams's "Sweet Swan of Avon", in which she is presented as the central figure in the literary circles of the era. Since the publication of Charlton Ogburn Jr.'s "The Mysterious William Shakespeare: the Myth and the Reality" in 1984, the Oxfordian theory, boosted in part by the advocacy of several Supreme Court justices, high-profile theatre professionals, and some academics, has become the most popular alternative authorship theory. In 2007, the New York Times surveyed 265 Shakespeare teachers on the topic. To the question "Do you think there is good reason to