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This famous poet and playwright penned many sonnets. An excerpt concerning Valentine's Day is found in one of his plays...
To-morrow is Saint Valentine's day,
All in the morning betime,
And I a maid at your window,
To be your Valentine.
Then up he rose, and donn'd his clothes,
And dupp'd the chamber-door;
Let in the maid, that out a maid
Never departed more.
Who is William Shakespeare?