This is a fascinating discovery!
A copy of the First Folio has been proven to have been annotated in John Milton’s own handwriting.
Read more about it at The Shakespeare Blog’s article titled Shakespeare annotated: John Milton’s First Folio
Shakespeare Annotated: John Milton’s First Folio
Shakespeare Nerd 
Reblogged this on WordyNerdBird and commented:
Every now and then, a fascinating discovery is made that thrills scholars and literature lovers alike.
This is one such revelation: the annotations on a rare First Folio are in the handwriting of 17th century poet John Milton, author of the epic poem Paradise Lost’.
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