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In page Oxfordian theory of Shakespeare authorship:

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Another frequently-cited parallel involves Hamlet's revelation in Act IV that he was earlier taken captive by pirates. On Oxford's return from Europe in 1576, he encountered a cavalry division outside of Paris that was being led by a German duke,[citation needed] and his ship was hijacked by pirates who robbed him and left him stripped to his shirt, and who might have murdered him had not one of them recognised him.[4] Anderson notes that "[n]either the encounter with Fortinbras' army nor Hamlet's brush with buccaneers appears in any of the play's sources – to the puzzlement of numerous literary critics."[5]