Rollo (l. c.860-c.930 CE, r. 911-927 CE) was a Viking chieftain who became the founder and first ruler of the region of Normandy. He converted to Christianity as part of a deal with the Frankish king Charles the Simple (893-923 CE) in 911 CE (changing his name to Robert) and his story was then embellished upon by later Christian writers who held him up as a role model: a savage Viking chief who became a paragon of Christian virtue and established law in the land. In doing so, however, they largely ignored whatever was known of Rollo's life prior to his involvement with Charles.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Rollo_of_Normandy/.