Eystein Halfdansson King in Vestfold [Semi-legendary] ^{1 2}

   Another name for Eystein was Eystein "Fret" Halfdansson King in Vestfold.

  Research Notes:

From Wikipedia - Eystein Halfdansson :

Eystein Halfdansson (Old Norse : Eysteinn Hálfdansson) was the son of Halfdan Hvitbeinn of the House of Yngling according to Heimskringla . He inherited the throne of Romerike and Vestfold .

His wife was Hild, the daughter of the king of Vestfold , Erik Agnarsson. Erik had no son, so Eystein inherited Vestfold.

Eystein died while pillaging in Varna . King Skjöld of Varna, a great warlock , arrived at the beach and saw the sails of Eystein's ships. He waved his cloak and blew into it which caused a boom of one ship to swing and hit Eystein so that he fell overboard and drowned. His body was salvaged and buried in a mound. Eystein was succeeded by his son Halfdan the Mild .

Eystein married Hild of Vestfold, daughter of Erik Agnarsson and Unknown.