Individual Details

Birth

Numbered Robert I to distinguish him from his descendants, he was a Norse nobleman of Norwegian or Danish descent and founder and first ruler of the Viking principality which soon became known as Normandy. His descendants were the Dukes of Normandy, and by later extension, the King of England.
The name "Rollo" is a Latin translation from the Old Norse name Hrólfr, modern Scandinavian name Rolf (cf. the latinization of Hrólfr into the similar Roluo in the Gesta Danorum), but Norman people called him by his popular name Rou(f) (see Wace's Roman de Rou). Sometimes his name is turned into the Frankish name Rodolf(us) or Radulf(us) or the French Raoul, that are derived from it.
Rollo was a powerful Viking leader of contested origin. Dudo of Saint-Quentin, in his De moribus et actis primorum Normannorum ducum, tells of a powerful Danish nobleman at loggerheads with the king of Denmark, who had two sons, Gurim and Rollo; upon his death, Rollo was expelled and Gurim killed. William of Jumièges also mentions Rollo's prehistory in his Gesta Normannorum Ducum, but states that he was from the Danish town of Fakse. Wace, writing some 300 years after the event in his Roman de Rou, also mentions the two brothers (as Rou and Garin), as does the Orkneyinga Saga.
Norwegian and Icelandic historians identified Rollo instead with Ganger Hrolf (Hrolf, the Walker), a son of Rognvald Eysteinsson, Earl of Møre, in Western Norway, based on medieval Norwegian and Icelandic sagas. The oldest source of this version is the Latin Historia Norvegiae, written in Norway at the end of the 12th century. This Hrolf fell foul of the Norwegian king Harald Fairhair, and became a Jarl in Normandy. The nickname "the Walker", "Ganger" in Norse, came from being so big that no horse could carry him.
The question of Rollo's origins was a matter of heated dispute between Norwegian and Danish historians of the 19th and early 20th centuries, particularly in the run-up to Normandy's millennium anniversary in 1911. Today, the debate continues.
The Yngling "Fairhair dynasty" lineage introduced in Hversu Noregr byggðist ("How Norway was settled") and the Orkneyinga and Heimskringla sagas suggests a line of Rollo going back to Fornjót, the primeval "king" who "reigned over" Finland and Kvenland.[citation needed] The claimed line leading to Rollo includes Rognvald Eysteinsson, the founder of the Earldom of Orkney

Marriage

It is not known if Poppa was actully the wife or mistress/concubine of Rollo.

Religion

Sometime around 927, Rollo passed the fief in Normandy to his son, William Longsword. Rollo may have lived for a few years after that, but certainly died before 933. According to the historian Adhemar, 'As Rollo's death drew near, he went mad and had a hundred Christian prisoners beheaded in front of him in honour of the gods whom he had worshipped,[citation needed] and in the end distributed a hundred pounds of gold around the churches in honour of the true God in whose name he had accepted baptism.' Even though Rollo had converted to Christianity, some of his prior religious roots surfaced at the end.