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Hephaestus is the god of fire, especially in so far as it manifests itself as a power of physical nature in volcanic districts, and in so far as it is the indispensable means in arts and manufactures, whence fire is called the breath of Hephaestus, and the name of the god is used both by Greek and Roman poets as synonymous with fire. As a flame arises out of a little spark, so the god of fire was delicate and weakly from his birth, for which reason he was so much disliked by his mother, that she wished to get rid of him, and dropped him from Olympus. But the marine divinities, Thetis and Eurynome, received him, and he dwelt with them for nine years in a grotto, surrounded by Oceanus, making for them a variety of ornaments. (Hom. Il. xviii. 394, &c.) It was, according to some accounts, during this period that he made the golden chair by which he punished his mother for her want of affection, and from which he would not release her, till he was prevailed upon by Dionysus. (Paus. i. 20. \xa7 2; Hygin.

Although Hephaestus afterwards remembered the cruelty of his mother, yet he was always kind and obedient towards her, nay once, while she was quarrelling with Zeus, he took her part, and thereby offended his father so much, that he seized him by the leg, and hulled him down from Olympus. Hephaestus was a whole day falling, but in the evening he came down in the island of Lemnos, where he was kindly received by the Sintians.

Pseudo-Apollodorus, Bibliotheca 1. 19 (trans. Aldrich) (Greek mythographer C2nd A.D.) :
"Zeus threw him [Hephaistos] from the sky for helping Hera when she was in chains. Zeus had hung her from Olympos as punishment for setting a storm on Herakles as he was sailing back from his conquest of Troy. Hephaistos landed on Lemnos, crippled in both legs, but saved by Thetis."