As when a lion from his cavern'd rock,
At distance hears the bleatings of the flock,
To seize his prey he springs, with hunger bold,
But faithful shepherds had secur'd the fold;
Defeated of his prize, he roars amain,
Rends his hoarse throat, and terrifies the swain.

Lines 1598–1603 - Argonautica (3rd century BC) - Book I