WILLIAM SHAKESPEARE: Hamlet

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It is here,......thou art slain;
No medicine in the world can do thee good,
In thee there is not half an hour of life;
The treacherous instrument is in thy hand,
Unbated and envenom d: the foul practice
Hath turn'd itself on me; lo; here I lie,
(Act 5, Scene Two, Lines 298-303)

The character being addressed is