From the English Wikipedia page on Eystein Ivarsson: http://en.wikipedia.org/wiki/Eystein_Ivarsson

Eystein Glumra also called Eystein Ivarsson was Jarl of Oplande and Hedmark in Norway, the son of Ivar Halfdan and the father of Ragnvald Eysteinsson. He was married to Åsa Ragnvaldsdatter, the daughter of Ragnvald Olafsson, king of Vestfold. [1]

References

1.^ Eystein Ivarsson Jarl of Hedemarken http://www.rpi.edu/~holmes/Hobbies/Genealogy/ps05/ps05_075.htm

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From the Foundation for Medieval Genealogy page on Norwegian Nobility: http://fmg.ac/Projects/MedLands/NORWEGIAN%20NOBILITY.htm#Ragnvalddied894B

[EYSTEIN “Glumra/Clatterer” .

Orkneyinga Saga names “Earl Ivar of the Uplands, father of Eystein the Clatterer…”[128]. Jarl of the Uplanders in Norway [in Kristian? and Hedemarken, the area around Oslo].

i) [RAGNVALD "the Wise" .

Orkneyinga Saga names “Eystein the Clatterer, father of the wise counsellor Earl Rognwald the Powerful…”[129]. Snorre names Ragnvald Earl of More, a son of Eystein "Glumra" when recording that he had become a supporter of King Harald who had invested him with the districts of North More and Raumsdal[130]. Jarl of North and South Möre and of Raumsdal in Norway.]

ii) [SIGURD "Riki/the Mighty" .

Orkneyinga Saga records that Ragnvald gave “all the islands” to “his brother Sigurd, the forecastleman on King Harald´s ship” and that Harald I "Hårfagre" King of Norway gave “the title of earl” to Sigurd who remained in the islands after the king returned to Norway[131]. Orkneyinga Saga records that Sigurd “joined forces with Thorstein the Red, the son of Olaf the White and Aud the Deep-Minded” and together conquered “the whole of Caithness and a large part of Argyll, Moray and Ross”, Sigurd building “a stronghold…in the south of Moray”[132]. Orkneyinga Saga records that Sigurd defeated and beheaded “Mælbrigte Earl of the Scots” but that he died from an infected wound because a tooth in Mælbrigte´s head, strapped to Sigurd´s saddle, scratched his leg, and was buried “in a mound on the bank of the River Oykel”[133]. The Complete Peerage identifies the place as “Sydero on the Dornoch Firth at the estuary of the Ekkialsbakki[134]. The Complete Peerage dates Sigurd´s appointment as Jarl to [875] and his death to [892][135], but there seems no basis for either date apart from internal consistency with its reconstruction of events in the lives of this family. Both dates should therefore be considered as extremely approximate, and as noted below the earlier date leads to difficult chonological difficulties with the reported career of Sigurd´s nephew Turf-Einar.] [One child:]

[GUTHORM .

Orkneyinga Saga records that Sigurd was succeeded by his son “Guthorm who ruled the earldom for a year but died childless”[136]. According to Snorre´s Harald Harfager´s Saga, Sigurd died “without children” but his Saga of Olaf Haraldson names Guthorm as son of Sigurd, recording that he succeeded his father as earl for one year[137].]

iii) [MALAHULC .

Orderic Vitalis names Malahulc as an uncle of Rollo and ancestor of the Tosny family[138]. He is not mentioned in the Sagas.] See TOSNY.