Who is the goddess of witchcraft in the play Macbeth?

Hecate is the goddess of witchcraft. She is found in Act
3, Scene 5 of Macbeth. In this scene, Hecate appears before the three witches. She
demands to know why she has been excluded from their meetings with
Macbeth:

How
dare you
Trade and traffic with Macbeth
In riddles and affairs of
death;
And I, the mistress of your charms,
The secret contriver of
all harms,
Was never called to offer my part,
Or show the glory of
our art?

Hecate adds that
Macbeth will be back to know what his destiny is. She proclaims that Macbeth will see
apparitions that will lead him to the conclusion that he will be safe. She plays an
important role in this scene in that she declares lines that reveal Macbeth's belief
that he will be untouchable. Of course, this ultimately results in his
downfall:

He
shall spurn fate, scorn death, and bear
His hopes above wisdom, grace, and
fear.
And you all know, security
Is the major enemy of
humans.