All 3 Uses

Hercules
in
War and Peace
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"You have a try, Hercules," said he, turning to Pierre.†
Chpt 1

Hercules = mythological Roman hero famous for his strength
E'en fortunate Napoleon
Knows by experience, now, Bagration,
And dare not Herculean Russians trouble...†
Chpt 4 *

herculean = requiring great strength or effort (like that of the mythological Hercules)
It cannot be the direct physical power of a strong man over a weak one—a domination based on the application or threat of physical force, like the power of Hercules; nor can it be based on the effect of moral force, as in their simplicity some historians think who say that the leading figures in history are heroes, that is, men gifted with a special strength of soul and mind called genius.†
Chpt 15

Hercules = mythological Roman hero famous for his strength

Definitions:

(1) (Hercules)
mythological Roman hero famous for his strength and for performing 12 immense labors to gain immortality
(2) (meaning too rare to warrant focus)