https://en.wikipedia.org/wiki/Rollo
Rollo , in some, later sources identified with Ganger-Hrólf ,[1][2][3] and baptised Robert, was a Viking who became the first ruler of Normandy, a region of France. Rollo came from a noble warrior family of Scandinavian origin. After making himself independent of the Norwegian king Harald Fairhair, he sailed off to Scotland, Ireland, England and Flanders on pirating expeditions, and took part in raids along France's Seine river.[4][5] Rollo won a reputation as a great leader of Viking rovers in Ireland and Scotland, and emerged as the outstanding personality among the Norsemen who had secured a permanent foothold on Frankish soil in the valley of the lower Seine.[5] Charles the Simple, the king of West Francia, ceded them lands between the mouth of the Seine and what is now the city of Rouen in exchange for Rollo agreeing to end his brigandage, and provide the Franks with his protection against further incursion by Norse war bands.


About Gange-Hrólfr 'Rollo' of Normandy
According to DNA-research, Rollo originated from Denmark: http://originsdna.blogspot.se/2014/04/exploring-rollos-roots-dna-leads-way.html

http://genealogics.org/getperson.php?personID=I00020055&tree=LEO

http://originhunters.blogspot.dk/2014/04/exploring...s-dna-leads-way.html

http://en.wikipedia.org/wiki/Rollo

Gangu-Hrólfr Ragnvaldsson, or Rollo de Normandie was a Norse nobleman and the founder and first ruler of the Viking principality in what soon became known as Normandy. The name "Rollo" is a Frankish-Latin name probably taken from the Old Norse name Hrólfr, modern Scandinavian name Rolf .

Parents: Ragnvald Eysteinsson Mørejarl & Hild Nefja
Spouses:
1. Poppa de Bayeux
Children:
Vilhjalm Langaspjót
Geirlaug who later took the name Adela
2. Gisela de France
There might be another daughter from a relationship on Iceland, by a mistress , uncertain:

Kaðlin

Roll may be the first credible member of this family line