Vulcan (Hephaestos), the celestial artist, was the son of Jupiter and Juno. He was born lame, and his mother was so displeased at the sight of him that she flung him out of heaven. Other accounts say that Jupiter kicked him out for taking part with his mother in a quarrel which occurred between them. Vulcan's lameness, according to this account, was the consequence of his fall. He was a whole day falling, and at last alighted in the Island of Lemnos, which was thenceforth sacred to him. Milton alludes to this story in "Paradise Lost," Book i.:

"... From morn
To  noon he fell, from noon to dewy eve,
A summer's day; and with the setting sun
Dropped from the zenith, like a falling star,
On Lemnos, the Aegean isle."
Bullfinch 1959:16-17.

Theseus "His first day's journey brought him to Epidaurus, where dwelt a man named Periphetes, a son of Vulcan. This ferocious savage always went armed with a club of iron, and all travellers stood in terror of his violence. When he saw Theseus approach he assailed him, but speedily fell beneath the blows of the young hero, who took possession of his club and bore it ever afterwards as a memorial of his first victory."

Bullfinch 1959:124.