Halfdan the Mild was the son of king Eystein Halfdansson, of the House of Yngling and he succeeded his father as king, according to Heimskringla. He was king of Romerike and Vestfold.
He was said to be generous in gold but would starve his men of... Wikipedia
Died: 802 AD, Vestfold, Norway
Parents: Eystein Halfdansson
Great grandchildren: Ragnvald Heidumhære and Gandalf Alfgeirsson
Great-grandparent: Olof Trätälja
Grandchildren: Halfdan the Black, Olaf Geirstad-Alf, Agantyr (?), and more
Children: Sigurd, 5th King of Haithabu
Grandparent: Halfdan Hvitbeinn