Sveigðir Fjölnarsson King in Sweden [Mythological] ^{1 2}

   Other names for Sveigðir were Sveigder King of Sweden, Swegde King of Sweden and Svegdi Fjolnarsson King in Sweden.

  Research Notes:

Mythological Swedish king, of the House of Ynglings.

From Wikipedia - Sveigðir :

Sveigðir, Sveigder or Swegde was a Swedish king of the House of Yngling in Norse mythology . He was the son of Fjölner , whom he succeeded as king, and he married Vana of Vanaheim , probably one of the Vanir .

Lured by a dwarf , Sveigðir disappeared into a stone and never came back. He was succeeded by his son Vanlandi .

Snorri Sturluson wrote of Sveigðir in his Ynglinga saga (1225):

Swegde took the kingdom after his father, and he made a solemn vow to seek Godheim and Odin . He went with twelve men through the world, and came to Turkland , and the Great Svithiod , where he found many of his connections. He was five years on this journey; and when he returned home to Sweden he remained there for some time. He had got a wife in Vanheim , who was called Vana, and their son was Vanlande . Swegde went out afterwards to seek again for Godheim, and came to a mansion on the east side of Swithiod called Stein , where there was a stone as big as a large house. In the evening after sunset, as Swegde was going from the drinking-table to his sleeping-room, he cast his eye upon the stone, and saw that a dwarf was sitting under it. Swegde and his man were very drunk, and they ran towards the stone. The dwarf stood in the door, and called to Swegde, and told him to come in, and he should see Odin. Swegde ran into the stone, which instantly closed behind him, and Swegde never came back.[3][4]

The Historia Norwegiæ presents a Latin summary of Ynglingatal written in the late 12th century and consequently older than Snorri's quotation:

Frøy engendered Fjolne, who was drowned in a tun of mead. His son, Sveigde, is supposed to have pursuded a dwarf into a stone and never to have returned, but this is plainly to be taken as a fairy-tale. He sired Vanlande, [...][7] The even earlier source Íslendingabók from the early 12th century, cites the line of descent in Ynglingatal and also gives Svegðir as the successor of Fjölnir and the predecessor of Vanlandi : iiii Fjölnir. sá er dó at Friðfróða. v Svegðir. vi Vanlandi[8].

Sveigðir married Vana of Vanaheim [Mythological].