aka Ragnvaldsson, Robert, Rolf the Granger (Rollo) of Norway, Rollo the Dane, Duke of Normandy (Directory of Royal Genealogical Data).
Papie was the Robert's pagan wife, or concubine, he repudiated in order to marry the daughter of the King of France. When she died childless, he resumed his relationship with Papie (Williamson, David. Debrett's kings and queens of Britain. Topsfield, Mass. : Salem House Publishers, c1986, g. 43).
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. Dudo's chronicle, commissioned for Richard I, was finished, sometime after 1015, for Richard II, whose sister, Emma, married the Danish King Cnut, in 1017. William of Jumièges also mentions Rollo's prehistory in his continuation of Dudo's work, Gesta Normannorum Ducum, but states that he came from the Danish town of Fakse.
Norwegian and Icelandic historians, basing their research on medieval Norwegian and Icelandic sagas, identified Rollo instead with Ganger Hrolf (Hrolf, the Walker), a son of Rognvald Eysteinsson (fl. 865), Earl of Møre in Western Norway. The Latin Historia Norvegiae, written in Norway at the end of the 12th century, offers the oldest source of this version. This Hrolf fell foul of the Norwegian king Harald Fairhair (c. 850 ? c. 932, reigned c. 872 ? 930), and became a Jarl in Normandy. The nickname "the Walker", "Ganger" in Norse, came from being so big that no horse could carry him.
Geoffrey of Malaterra, in his The Deeds of Count Roger of Calabria & Sicily & of Duke Robert Guiscard his brother claims Rollo "sailed boldly from Norway".
The question of Rollo's origins became 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 (wikipedia)