Freyja

Ynglinga Saga ch. 4, about 1230, says Freyja first taught the Æsir seiðr, the magic of the Vanir. It names no pupil: chapter 7, on Odin's own seiðr, never mentions her.

Snorri Sturluson, Ynglinga Saga chs 4 and 7 (c. 1230), trans. Samuel Laing (1844)

Norse goddess of the Vanir who takes half the slain to her hall Fólkvangr.

Sources3 sources

Primary source

Snorri Sturluson, Ynglinga Saga (Heimskringla), trans. Samuel Laing, 1844, ch. 4Freyja, Njörðr's daughter and a priestess of the sacrifices, first taught the Æsir the Vanir magic (seiðr); no pupil is named.
first taught the Asaland people the magic art, as it was in use and fashion among the Vanaland people
Snorri Sturluson, The Prose Edda, trans. Arthur Gilchrist Brodeur, 1916, Gylfaginning chs 24 and 35Snorri's Freyja has Fólkvangr and half the slain, drives her cats in a chariot (ch. 24) and weeps tears of red gold for Óðr (ch. 35).
Freyja weeps for him, and her tears are red gold
Anonymous (Poetic Edda), trans. Henry Adams Bellows, Grímnismál, 1923, stanza 14The older eddic poem already gives Freyja the choice of half the slain at Fólkvangr, before Snorri.
The half of the dead | each day does she choose