I think you are talking about the twelve leaders of Aesir. That or Valkyries who traveled in squads of seven, nine or twelve.
The chief god of Norse mythology is Odin.
Norse Mythology originated in early Scandinavia.
Norse mythology, or you can also say the myths of Scandinavia.
Norse mythology's chief god was odin.
the word 'Norse' would be capitalised, but not 'mythology'.
Norse mythology comes from early Scandinavia.
Asgard is the home of the gods in Norse Mythology.
Some call it the Norse Religion, Viking Mythology, and the Viking Religion, but the most correct is Norse Mythology.
Amazon.com has a wide selection of books on Norse Mythology.
I can't seem to find a reference to Ijosalfa in Norse mythology.
Hestia is the Greek goddess of the hearth, home, and fire; she is not a part of Norse mythology.
No, Ares the Greek god of war does not appear in Norse mythology.