WIkipedia states this on his son SIgurd Syr's page:
The traditional view of Sigurd Halvdansson Syr's pedigree, as presented in various Icelandic poems and historical sagas culminating in Snorri Sturluson's Heimskringla, is that he was a great-grandson of King Harald Fairhair, through Harald's son Sigurd Rise. Doubt has been cast on his connection with Sigurd Rise, a relatively obscure son of Harald Fairhair by a Sami girl named Snæfrithr Svásadottir.[1] Sigurd Syr's father Halfdan may not have been King Harald's grandson Halfdan of Hadafylke.[2] There are no contemporary attestations of such a Halfdan.[3] It is not very likely that this lineage represent historical realities. Many modern historians regard the Fairhair genealogy as in large part invented.[4]
https://en.wikipedia.org/wiki/Sigurd_Syr
and The Peerage link listed as a source...has no source for the connection:
http://www.thepeerage.com/p4276.htm#i42756
Last Edited=18 Dec 2003
Sigurd Hrise, King of Hadaflyke is the son of Harald I, King of Norway and Snefried (?)
He gained the title of King Sigurd of Hadaflyke.
Child of Sigurd Hrise, King of Hadaflyke
Halfdan Sigurdsson, King of Hadaflyke+
So, IS Sigurd Rise the father of King Halvdan "The Gray" Sigurdsson? Are there any sources that document the connection with valid sources?
Thanks for any clarificaiton. I'd love to believe I descend from a Sami woman, but I don't want to connect it in my personal tree if it's not accurate.