Norse Mythology: Goddess concerned with sparking passionate love. She had permission from Odin and Frigg to do so even for those who were forbidden to marry.

(Nicole Cherry, A list of Norse Beings, http://www.ugcs.caltech.edu/~cherryne)

Note the similarity with Roman and Greek mythology, which also had two goddesses of love: Venus / Aphrodite for passionate love, and Juno / Hera for married love.