Aulë is a Lord of the Valar, one of the Aratar, and the third Lord of the Valar
in order from Manwë and Ulmo, so he is great indeed.
Singer of the Earth, Aulë created all land
including the gems and metals. His craftsmanship is of the finest, and
he is incorruptible by mere "things" because he loves the making, but
is not possessed by the item. Thus has he earned the jealousy of
Melkor. Aulë is the originator of
the Dwarves, a work blessed by Eru with the Flame Imperishable so that
they
came to life. Aulë's wife is Yavanna.
Aulë is known as Mahal to the Dwarves, who believe
that he cares for them and has a hall set apart for them in Mandos
where they
go to him after death. They say he told their seven forefathers that
Eru
will
hallow them so that they will be placed among the Children of Eru in
the
End. Then they shall serve Aulë, aiding him in rebuilding Arda after
the
Last Battle, and the seven forefathers shall return under their own
names
to live with their kin. (Silmarillion)
Also he is called by the names of Taglos and
Martamo.
Reference: Silmarillion
especially "Ainulindale", "Valaquenta"
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Image - "Aule creating dwarves". Artist: Natalia Nikitin. Rolozo Tolkien
page.