Aulë was an Ainu and a Vala created by Eru Iliuvatar, and his lordship was over all the substances of which Arda was made. He was a Smith and master of all crafts, the Smith of the Valar. He was a third of the power in Aratar.
He enjoyed devising and making new things and being praised.
His are the gems that lie deep in the Earth.
Noldor learned most of him.
His wife was Yavanna, the Giver of Fruits.