Hugleikr's Seiðmenn

It was the son of Álfr called Hugleikr who became king over the Svíar
after the brothers, because Yngvi’s sons were still children then. King
Hugleikr was no warrior, and he stayed peaceably on his estates. He was
very wealthy, and stingy with money. He had in his court a lot of all kinds
of players, harpists and fiddlers. He also had with him sorcerers and
all kinds of practitioners of magic. There were brothers called Haki and
Hagbarðr who were very fine men. They were sea-kings and had many
followers, travelling sometimes together, sometimes separately. They
both had many champions with them. King Haki went with his force to
Svíþjóð against King Hugleikr, and King Hugleikr assembled a force to
meet them. Then two brothers, Svipdagr and Geigaðr, came to join his
company, both outstanding men and great champions. King Haki had
twelve champions with him. Starkaðr gamli (the Old) was with him. King
Haki was also a great champion. They met at Fýrisvellir. A great battle
took place there. Hugleikr’s company fell quickly. Then the champions
Svipdagr and Geigaðr advanced, but six of Haki’s champions went against
each of them, and they were taken captive. Then King Haki penetrated the
shield wall against King Hugleikr and killed him and his two sons there.
After that the Svíar fled, and King Haki took power over the lands and
made himself king over the Svíar. He stayed in the lands for three years,
and in this time of peace his champions left him and went raiding and so
gained wealth for themselves.


- Heimskringla, Ynglinga Saga, Chapter 22


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The Old Norse version uses the word "seiðmenn" when talking about the sorcerers in Hugleikr's court. Here's an excerpt:

"Hugleikr hét son Álfs, er konungdóm tók yfir Svíum eptir þá brœðr, því at synir Yngva váru þá börn at aldri. Hugleikr konungr var engi hermaðr, ok sat hann at löndum í kyrrsæti; hann var auðigr mjök ok sínkr af fé. Hann hafði mjök í hirð sinni allskonar leikara, harpara ok gígjara ok fiðlara; hann hafði ok með sér seiðmenn ok allskonar fjölkunnigt fólk."

Taken from the Old Norse version of Ynglinga Saga available at heimskringla.no.