Possible Clues:

• 'Monster' in The Tempest
• The Tempestisland native
• So tempestuously beastly that at last I prohibit him
• Monster in "The Tempest"
• Savage slave in 'The Tempest'
• Knox's monster of Grub Street
• With clubs, I pitched into saint - brute!
• Monster of The Tempest
• Might one nail the cab during a tempest?
• Slave, defence cut short, put in prison