In Greek myth, the Olympian gods were preceded by a race called the Titans, one of whom was Prometheus.
Prometheus created the first men out of clay. (Women came later.)
In order to improve the lives of his creatures, Prometheus gave them fire and taught them how to use it. Unfortunately, he stole the fire from Olympus, and Zeus punished him for his audacity.
The punishment inflicted upon Prometheus for defying the law of the gods was to be chained to a rock in the Caucasus mountains. Every day an eagle came and fed on his liver. Every night the liver grew back and Prometheus suffered anew the next day.
The adjective promethean means “skilful, creative, audacious.”
The full title of Mary Shelley’s 1818 novel is Frankenstein; or, The Modern Prometheus. In giving life to the materials he assembles, Dr. Frankenstein commits a promethean act.