The two brothers engaged into battle with Heracles at Liguria of North-Western Italy.
This version was mentioned in Aeschylus' play Promētheus Lyomenos, now lost.
[4] Having obtained the Cattle of Geryon as his tenth labour, Heracles was passing through Liguria, on his way back to Mycenae from Iberia.
With the aegis of Zeus, Heracles won the battle and both brothers were killed.
[5] It was this kneeling position of Heracles when prayed to his father Zeus that gave the name Engonasin ("Εγγόνασιν", derived from "εν γόνασιν"), meaning "on his knees" or "the Kneeler" to Hercules' constellation.