"his Herculean efforts"

Hercules is the Roman name for the Greek mythological figure Heracles, who was adopted and adapted in Roman culture.

Hercules is famous for the story in which in a fit of madness he killed his sons and in order to cleanse himself he had to perform twelve tasks or ‘labours’ set to him by an oracle. These labours, which he managed to complete, showing super-human strength and determination, included capturing the Golden Hind of Artemis, stealing the girdle of Hippolyta and bringing back Cerberus, the three-headed dog who guarded the entrance to the Underworld. A full list can be found here.