Helunu, daughter of king Ælla. - dates

I have changed the date of birth from c787 to c830 based on the fact that her father is born c800 (see this Discussed http://www.geni.com/discussions/147240?msg=1022169)

I have deleted the death date of c840 as this pre-dates the death of her father Ælla (and probably also her father-in-law Ragnar) which would mean that her marriage to Sigurd would have to have been BEFORE Sigurd and his brothers killed her father and possibly before her father killed her father-in-law after the latter invaded her homeland. All of which sounds slightly less logical than if Sigurd married her AFTER Ælla's death.

So married sometime after 867 and death?
The saga of Ragnar's Sons mentions at least one son of this marriage but Geni shows six children which would in all probability push her death date further out towards mid-870s.