Notes:

"Ragnarsson, Ivar "the Boneless", King of Dublin
Acceded: 856
Died: 873
Notes:
Conquered York 866/7, Slayer of St Edmund of East Anglia 869.
Father: Lodbrock, Ragnar
Mother: Sigurdsdottir, Aslaug
Child 1: Halfdansson, Sichfrith, King of Dublin
Child 2: Halfdansson, Sitric (Sigtryggr), King of Dublin
Child 3: Ivarsson, Son
Child 4: Ivarsson, Son
Child 5: Ivarsson, Son
Child 6: Ivarsson, Son"

From
http://www.dcs.hull.ac.uk/cgi-bin/gedlkup/n=royal?royal09491
At
Royal and Noble Genealogical Data on the Web
http://www.dcs.hull.ac.uk/public/genealogy/
Directory of Royal Genealogical Data
http://www.dcs.hull.ac.uk/public/genealogy/royal/
Peerages in Order of Precedence
http://www.dcs.hull.ac.uk/public/genealogy/royal/peerage.html
Master Index to royal Genealogical Data - ordered by lastname
http://www.dcs.hull.ac.uk/public/genealogy/royal/gedx.html
Author: Brian Tompsett.
Brian Tompsett's sources athttp://www.dcs.hull.ac.uk/public/genealogy/royal/reference.txt