Some mythologists have compared the hammer of Hephaestus with that of Thor, and have explained it as the emblem of a thunder-god; but it is Zeus, not Hephaestus, who causes the thunder, and the emblems of the latter god are merely the signs of his occupation as a smith.
He is represented as specially lord of the elements, the thunder-god.
Also the close special association of the European Thunder-God and the oak-tree has recently been exposed.'
See Chadwick in Anthropological Journ., 1900, on " The Oak and the Thunder-God."
Odin's wife was Frigg; their sons were Thor (the thunder-god) and Balder, whose myth is well known in English poetry.