Rack and unicorn

Like as a Lion whose imperial power
A proud rebellious Unicorn defies,
T'avoid the rash assault and wrathful stour
Of his fierce foe, his to a tree applies,
And when him running in full course he spies
He slips aside; the whiles that furious beast
His precious horn, sought of his enemies,
Strikes in the stock, nor thence can be released,
But to the mighty victory yields a bounteous feast.
--Edmund Spencer--